In case you missed it, The Lr 3 beta for Mac OS X is also Intel only (pdf link to the release notes). You might want to check out the 30-day evaluation version of Lr 2.5 instead.Thanks for all the input. I am definitely not in a hurry to make this decision, so I think I'll just download the lightroom 3 beta and play around with it to see if it will work for me. If so, I'll get the full version when it comes out.
From what people have said, it sounds like the current version of aperture is a little iffy, and i'll likely be kept from any future updates (intel only), as Im not planning on upgrading from the G5 any time soon.