Since I spend somewhere between 85% and 95% of my day on the Web, I try out a lot of new services. Most of what I try, I end up ditching, but there are the few that stick with me long term and truly adjust my daily work habits. I am talking about services like Dropbox, Mozy, Skype, and Tweetdeck. The ultimate example of a service that has completely replaced its predecessor is of course Gmail.