I bought a powerbook about 6 months ago and I have OSX 10.3. I've considered getting 10.4 but i don't really see a reason to. I don't need the dashboard because I have konfabulator (which will have even more widgets now that yahoo owns it), and i don't think i need a desktop search. I know, i know, "once you use it you'll never go back." I just don't think its worth $129 to search my desktop. i'll save the money and put stuff in folders where i'll remember to look for em.
anyway, the only reason i would upgrade to tiger is if the major applications started to be "tiger only". will this happen, or will pretty much every program work in all the OSX's? because if i'll need to upgrade later down the line i might as well do it now. i just don't want to if its not necessary