Windows 32bit Family XP RTM - 5.1.2600
XP SP1a - 1106
XP SP2 - 2180
Server 2003 RTM - 5.2.3790
Server 2003 SP1 - 1830
Server 2003 SP2 - 3959
Vista RTM - 6000.16386
Server 2008 Beta 3 - 6001.16510
Windows 64bit Family XP 64bit RTM - 5.2.3790.1830
XP 64bit SP2 - 3959
Server 2003 64bit RTM - 5.2.3790.1830
Server 2003 64bit SP2 - 3959
Vista 64bit RTM - 6000.16386
Server 2008 64bit Beta 3 - 6001.16510
As of this morning, the RTM version of Visual Studio 2008 (was codenamed Orcas) is available for download from the MSDN subscribers site.
Now I'm going to sound like a licensing guy for a second, but stay with me because I might have good news for you. If you have an MSDN subscription, you have software assurance for Visual Studio. This means that your MSDN subscription Licences you to use all the versions of Visual Studio that are released during the term of your contract. i.e. if you have an MSDN subscription, you have already paid for your rights to use 2008 - go get it, go use it :-)
For my money, the killer feature is the new build triggers and build retention features. This allows you to do continuous integration out of the box and should help ensure that you don't ever run out of disk space on your build server. For more details on this feature, have a watch of the Channel 9 video:
Also included is .Net Framework 3.5, new language features (including LINQ), designers for WPF, WF - but I'm a TFS guy and an naturally biased as to what the best bits are :-). For some other opinions:
Daniel blogged a list of his top 10 2008 features here.
Soma's blog is a good place to look to find more information on the other new features in 2008.
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