Greetings, sorry about taking a week or so to reply.
You posted a comment in response to my Orange Love desktop [link]
asking about bugs or issues with Lion and so far I've seen very few and I think that the update was well worth it! I haven't yet latched on to Launch Pad in particular, but the new multi-touch gestures are *awesome*, especially when using the wireless trackpad. Those items that have proven a bit annoying are unfortunately bugs in 3rd party software (NerdTool not working at all on Lion, and no plans to fix that so far AFAIK) or they're design changes (customizing the icons of apps bought on the App Store apparently prevents those apps from auto-updating). But I can get around the annoyances so far, I'm going to try using Drag Thing a bit more and the dock less, switch back to GeekTool, etc. So I'm digging it!
As to Ubuntu, my MacBook Pro is triple boot already, OS X, Win 7 and Ubuntu (Natty Narwhal, 11.04). But it's my first real experience with Linux in the sense of having it on my machine for "regular" use. I say "regular" as I've not used it nearly enough and am going to try and get in the habit of using Linux at least once per week (leaving Windows as an "as needed" OS).