The folks over at Cenqua have really been working hard at making XP easier. Check out there latest product... the PairOn. I wish I could get one of these. I've been using one their Commentator for a few weeks and have been very happy with it. I wish it let you define your own custom dictionary. People know I frequently mistype words, so it should have an option to enter my commonly misspelled words and typos to give it more realism.
On a more practicle side, I looked at their FishEye product. While it looks pretty, I'm not sure that it helps solve anything for me. Personally I'd find Blame more interesting and useful.