The EU commission has reached an interesting agreement with Microsoft: Microsoft will present European users with a choice screen allowing them to select one of many browsers as their default browser. In principle, this is a great idea, if they could decide to offer users three or four browsers; very probably the users will have 10+ choices.
While this is supposedly good for users (and excellent for niche browser vendors), increased market share of currently irrelevant browsers might spell trouble for web developers using non-mainstream technologies (my favorite example: client-side XSLT transformation). For example, the percentage of users not using Firefox, IE or Chrome (yes, in that order) on one of my web sites is well below 5%, so I don’t care too much whether every little details works as it should. The situation would change drastically if they “minor” browsers would represent 20% of my users.