Worth upgrading right now for a q6600 and P45 or wait for nehalem and new mobo lines ? I dont really need to upgrade, but I feel like doing so. I dont want to end up having old technology in 2 months though.
What do you have currently and how much is your budget?
If your budget is 800 or less definitely build now. If it's 1200 or more, I'd definitely wait. If you're in the middle, you can go either way depending on how dated your current rig is.
You can, of course, look at an upgrade to tide you over in the meantime such as a new video card or HDD.
I'd build now, with that kind of budget, it will be quite some time before you can get parts for core i7 that will fit your build (ie sub $200 CPU, and ~100 mobo). There are so many good deals now - check out this thread (http://www.hardforum.com/showthread.php?t=1349272) for a great example of build you can do now.