Intellisense for jQuery
For some strange reason even Microsoft has embraced jQuery and will include it in future versions of ASP.NET. Recently they released files that enables intellisense in VS2008. SP1 for VS2008 is required, but it also works in the the express version.
When all this is done, simply reference the jQuery file and enjoy a few extra nanoseconds of productivity.
I was pleasantly surprised by this unexpected move by Microsoft, but I guess they have realized that people prefer jQuery instead of the bulky ASP.NET AJAX framework.