cool pictures.
are the dots on the first picture birds? your lens / filter / sensor might be a tad dirty =) Or a nice cloning tool in photoshop should clean those up.
also one really good thing when doing landscapes is to make sure your horizons are pretty much 0 degrees. it makes the picture just that much more perfect.
Another fun suggestion when shooting landscapes with the sky way brighter than the land, look for gradual ND filters. 2filter.com has a great package for a cokin-p holder / hitech filter set. I'd get the stronger of the soft edged GND's. Look it up, it'll make your skies REALLY nice and allow you to correctly expose for the foreground.
Great shots though! nice lens too.