Sharepoint pages cannot be async, just Web Parts

http://daniellarson.spaces.live.com/blog/cns!D3543C5837291E93!180.entry

Only AJAX/jQuery can be used

http://www.codefornuts.com/2009/09/forcing-sharepoint-into-asynchronous.html

http://jpoint.codeplex.com/

http://www.novolocus.com/2009/06/29/rounded-corners-on-web-part-zones/

http://weblogs.asp.net/jan/archive/2009/07/02/sharepoint-search-as-you-type-with-jquery.aspx

http://feedproxy.google.com/~r/PaulGalvinsSharepointSpace/~3/vyjC3_TO7QI/cns!1CC1EDB3DAA9B8AA!3996.entry

http://www.endusersharepoint.com/?cat=457

http://dotnetslackers.com/Sharepoint/re-154971_Integrating_SharePoint_2007_and_jQuery_Part_One.aspx

http://ajaxian.com/archives/when-generated-javascript-goes-wild-javascript-wtf-in-sharepoint

Get the Sharepoint 2007 AJAX toolkit from CodePlex http://www.codeplex.com/sharepointajax

Other Sharepoint AJAX posts:

http://blogs.msdn.com/italy/archive/2009/05/16/ajax-control-toolkit-nuova-versione-disponibile.aspx