Pentax users: What lenses are good for landscape, wildlife shots?

Just got a Pentax K200d for by b-day (wow!) and am wondering what you guys use out there for landscape and wildlife shots. Also, do you have a favorite for macro work? I've been in the Canon system (non-slr) for several years, and don't know the Pentax terminology (ie abreviations) yet. Another thing: should I be happier about the K200d or the Canon Rebel XSi?

Any help would be appreciated.

 

Here is the current-production Pentax line-up.

 

da* 50-135 is good

 

The 21mm Limited is a superb medium wide angle- a compact, hand-assembled, aluminum knock-around prime that I keep on one of my bodies at all times.