Background
I'm expecting my pair of Black Ocellaris to lay eggs this year. I picked them up from the LFS 16 or more months ago or more and they were already bonded. They were wild caught so I don't know exactly how old they are. I'm guessing they were from the same family group because they were both the same size which means that they were probably both juvenile males in the hierarchy. Anyways, they remained the same size for about a year and then I moved them from my 14g to a brand new 34g Red Sea Max. They slowly changed size over the last year and now one (the female) is 3" and the other (the male) is about 1.75". I notice that the female is continuing to get larger and the male is continuing to get smaller. There's no doubt that they're a pair now since they sleep in the same anemone at night.
My Questions
OK so now on to my questions! For the past few months the male has been biting (cleaning I guess?) the same place on the shaded underside of a rock. He hits it with his tail, too. He cleans off the sand around it and does this a lot while I'm watching them. The female doesn't seem to be too interested, but she occasionally helps. The place on the under side of the rock is right next to a 10"+ GBTA and right below a 10"+ RBTA. I think this is where they'll lay eggs if they do and sometimes after the male cleans it he'll do his special vibration dance. I think the male is very overly enthusiastic and the female doesn't really care. The female will sometimes "kiss"/bite the male's stomach. Not like as a threatening bite or angry/dominant bite, but more of a gentle "kiss" sort of thing. I'm guessing that these are pre-spawning behaviors but they've been going on for a few months. Are these actual pre-spawning behaviors? Are there any other behaviors I should be looking for? What are some other pre-spawning signs? I want to know what exactly to look for so if they do lay eggs later this year I'll know in advance to do my reading and research on raising their babies so that I can hopefully successfully raise and sell/trade the babies. Any information/conformation on my information and experiences will be well appreciated.
I'll try and order it on Amazon tonight. 
In my experience, I had a bonded pair and the little male clown would dance his heart out for the female, cleaning and prepping of a spot for several weeks, then months and nothing. I introduced a bigger clown, and what I thought was the female of the original pair now is the male and they started spawning last July. Now the three of them share the anemones (yes, it's a complicated thing)
My brother experienced the same issue with black clowns, wild Australian from AC in San Francisco; bonded pair but nothing, no eggs no prepping of nest, nothing. He introduced them to his tank and boom, love at first sight with a false percula female. Now they spawn regularly and the smaller black clown is always close to the breeding pair.
You may search RC too for a used one, if I come across one I'll let you know.
have you read Matt Wittenrich's book? By far the best one on breeding out there. Joyce's is good, but many of the culture techniques/feeds/etc are highly out dated.
http://www.amazon.com/Complete-Illustrated-Breeders-Marine-Aquarium/dp/1...

Is there a good (single?) resource for up-to-date feeds etc to supplement the book?
The book I posted is the best thing out there at the moment. It covers more then just clowns.
You may search RC too for a used one, if I come across one I'll let you know.
I'm not sure what adding another clown would do, but the pair I have had spent 6 or more months bonding in the LFS and I've had them for 16 months so they've has a strong bond for 2 years. For 16 months of that time they were the same size, but now that I look at the female, she is at least 2 times bigger than the male. I'm pretty sure that they're a couple, I just want to know what pre-spawning and spawning is like for clowns so that I can identify it and when they lay eggs I will know my facts on raising them from eggs, to larvae, to juvenile stage so I don't screw up and kill them.
Also I notice that when I add new sand/siphon sand and make it flat that the male will go down on the sand bed right in front of his selected place to spawn and shimmy to make a crater in the sand. Sometime's he randomly does it but between the pair's big 10"+ GBTA and the far right and the place where the male chose as their future spawning rock, there is a huge 1" deep crater in the sand that is about 10" log and 6" wide. This might be to keep the area clean or redirect the flow to keep the rock clean. Sorry for double-posting! 
Matthew I'm not suggesting adding another clown; is something that I noticed.
A bonded pair might be together for a long time and not spawn; I had hopes on the clowns to spawn but did not happen until I adopted a bigger female; I don't know what did the trick.
Took my family on a short four day vacation in July, when we came home I noticed an orange maze on a rock right next to the anemone; we were so excited end ever since they lay eggs ~15 days; 10 days for them to hatch and a few more days for them to prep the nesting site and they do it again.
Similar happened in my brother's tank but he already had the female.
Thx Gresh on the info on the book; I find JW's book to have lots of info on different types of clowns but will keep an eye open for the other one.
I think I'll just wait this one out instead of getting another clown. Also, how long should I wait to order rotifiers once the eggs have been laid?
Joyce Wilkerson's book called Clownfishes is the book to get. They can clean rocks for a long time before anything happens but once the eggs are laid, the male will be fanning regularly.
Mona