Hey, how are you doin'? I know long time no written, this is not because I became a lazy guy or something, that's because I am now in the end development's phase of our (the rest of the members were kept in secret - for now...) private web application called crashcourt.com (temporary name) - I have to say that the outcome is very impressive - the hard word has worthwhile.
BTW, if you want to be a part of our unique friends & family BETA testers/users, just leave me a comment here, I will be glad to send you an invitation soon...
Regarding the post' subject, if you are using the great AJAX toolkit from Microsoft, it's important you to know that a new version was released by this project members. The major improvements (by the authors) are: ListSearch and AutoComplete.
You can read some more details about it at Delay's blog here.