Hi All, just wanted to point out a teensy weensy but maybe very useful tip. It might be outdated information if you are using SharePoint 2010, but if you are using SharePoint 2007 then you might find this useful.
I am sure all of you working with SharePoint has come across Heather Solomon through her blog, it being a really wonderful resource for skinning SharePoint. Heather also has provided a ton of help to the SharePoint community by sharing the minimal masterpages for WSS and MOSS.
What I wanted to point out is that if you are suffering from AJAX controls not working propperly on the above mentioned master pages you might want to change
<WebPartPages:SPWebPartManager runat="server"/>
<form runat="server" onsubmit="return _spFormOnSubmitWrapper();">
to
<form runat="server" onsubmit="return _spFormOnSubmitWrapper();">
<WebPartPages:SPWebPartManager runat="server"/>