Development project priorities

I'm definitely still in the 10.4 boat because I am a student and since when do students have money? (I bought the laptop myself almost four years ago with all my high school graduation money.) "Why aren't you using Linux" isn't a valid argument, because I already have... let's see... one, two, three, four machines running Linux. Clearly I'm using OSX because I want to. Also, I never saw any compelling reason to buy the upgrades. 10.4 has worked perfectly for me, and I didn't see any features in the newer versions that I cared about, so it was effectively an upgrade tax from my point of view.

To be fair, however, I'm planning on buying a new Apple machine in several months when I have a "real job." I understand that 10.4 is a few versions out and Apple doesn't have the same track record for backwards compatibility as Microsoft (yes, MS kicks *** in that respect, no matter what else you say about them).