reetcher,
No one's forcing you to upgrade your OS. In the time it takes to wait out the initial release and the however long afterward that it takes for software companies to update their products, Apple will still support your current setup. I don't really understand what your point is about this. You get along fine with Tiger now. Why all the stress about upgrading or 'omg, should I get XP instead??'? Just keep doing what you've been doing for another month or so and then upgrade to Leopard, as you seem to have planned... ???
On another note, "HP" doesn't run all of those programs; all of those programs run on Windows. Not as efficiently, and with larger hardware requirements, but they do. The OS is a big deal. Ever had a memory leak on an OSX system? No? You can get it just by putting in any Windows install disk and letting it sit in the tray for a couple of hours. It will cause a memory leak that will make it so no matter what you're doing, eventually your memory is full and your computer will auto-shutdown. Beautiful piece of work, that.
To put it simply; if your OS isn't stable, your computer isn't stable. If your computer isn't stable, you need to hire a Tech if you're going to use it for any amount of serious work.
- Kira