Now I know I had previously posted that I was going to hold of until Jaunty (Ubuntu 9.04) was a stable release! (April 23rd) I've bitten the bullet and tonight I've just run the distribution upgrade on my desktop!
After downloading 1300+ packages and three hours later… I'm now running on Ubuntu Jaunty Jackalope! so far all applications seem to be just fine! So I can say at this point I'm happy! 🙂