I've only explored the city region briefly Robert. Its perty. I think my tree is somewhere just off the upper righthand corner.
Oh and yep, 1.5 is out. I only played a few minutes though as I think I'm going to wait for my texture pack to update as well.
Changes I noticed:
Looks like the 'ladder piece every other block' technique doesn't work anymore. I nearly got trapped down my mineshaft.
Also hostile mob spawning while you sleep seems to have been changed. My formerly safe backup sleeping cave is now a deathtrap.
On the negative side, I don't know if my game is glitching or what, but I just tamed a second wolf, and now I can't get my first one to stand up from sitting.