Microsoft® Visual Studio® 2005 Service Pack 1 Downloads

Visual Studio® 2005 Team Suite SP1

Visual Studio® 2005 Team Foundation Server SP1

Visual Studio® 2005 Express Editions SP1

There's no specific VS 2005 Standard or Professional SP1, so I assume you should use the Team Suite version? I've read the Team Suite SP1 page a couple times and it's not really clear. All I have is Team Suite so I can't confirm this myself.

[Update: Nick commented that Rob Caron has confirmed that the Team Suite download DOES apply to Standard, Profession and Team Edition installs]

Also if you're using VS2005 on Vista, check out the installation instructions (it has to be run elevated, can take a while, etc)...

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VS2005 SP1 RTM