I'll concur - now is good time to get into a-wdp. If you've done any swing or the like, (anything MVC) then it's a doddle. But many old style a developers won't be able to cope - it's the same with a-objects. ( Similar to the difference between vb and .net).
walld have been investing a lot in a over the recent years. At the .net (ahem) developer network community day there were some fairly interesting demos of the stuff that can be done with a-wdp. flex islands et. al. readily integrable.
I'm stuck with bsp at the moment, but start a project in april with hopefully lots of a-wdp.
I've just done my first a-wdp !!!! The tutorials are half way understandable but now I've not a clue how it all fits together. I suspect it is just learning what and when to click, piece of p*ss !!!!!
I've done plenty C++ so the a-objects aren't that daunting.
I can feel the next train coming my way, toot toot !!! All aboard !!!
ps. might not get here until late 2010 though