I have created for myself a little Wikipedia button in my browser that I find very useful. I want to share it with you now. It works perfectly for me in Netscape under Linux, but I assume there will be a few minor problems with Windows and IE.
NEW: there is a Windows IE version and a Netscape version. I look forward to feedback on both...
(For now visit this page: Magic Button Instructions
Then, you can go to any web page, highlight any text of interest, click the button and magically search on Wikipedia for that text.