Today I joined del.icio.us and digg, to find some new websites and blogs about webdesign/web 2.0 and social networks. So I found some cool tutorials about Ajax, which is most used today. Best example for Ajax is GoogleMail or their such other online services which Google created (Spreadsheet/Text writer).
Are you interested to learn Ajax and create such nice effects, too ? Then click here for Five basic Ajax Tutorials.
I found also a other page which has a big Ajax/JavaScript/Dhtml library. Click here to open up this site.