Well the newest Ubuntu version was just released, Ubuntu 10.04 Long Term Support(LTS), codenamed "Lucid Lynx". You can download it here and check it out. I've heard lots of good things about this latest version, especially the groovy updates to the look, namely the change from the orange/brown look of 9.** to the slick purple we see in 10.04. Although a still a little dark for my tastes, I'm sure that there are plenty of other themes and backrounds with the latest version.
Ubuntu 10.04 does not include the GIMP anymore as it has been called to "professional" and the "simple photo editor" job has been taken over by F-Spot (which is also included in 9.10). F-Spot is alright, although a bit confusing seeing as you can't do "simple" things like go into edit mode from the F-Spot photo viewer, instead you must open the separate F-Spot photo editor.
Lucid Lynx also includes the Ubuntu One service, which gives you 2gb of online storage space. You can access this anywhere (from a computer running Ubuntu One). Another features is the Ubuntu music store now included as a default link in Rythmbox, where you can download DRM free music. (If you don't know what DRM free means check out this)
Although I have yet to install it on my normal computer, I am looking forward to seeing it in action with all my routine work.