VS2008 SP1 and .NET 3.5 SP1
Yes, now it is released and you'll get it at: http://www.asp.net/downloads/3.5-sp1/
Interesting point regarding some old posts of mine e.g
Potential solution for "Validation of viewstate MAC failed"
In SP1 is included a fix for ASP.NET 3.5, which lets you control if the hidden fields are rendered on top or at bottom of the form. There is a new setting in <pages> element of web.config, as follows:
<pages renderAllHiddenFieldsAtTopOfForm="[true|false]" / > // Defaults to true in 3.5 SP1
Note that this SP also adds SQL2008 support for VS2008, so be sure to install it.