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Basically, SharePoint says it needs .NET Framework 3 but when you search on that version on, it guides you towards v3.5

Cheers, Rob.

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up vote 1 down vote accepted

It is a separate version.

But it includes .NET Framework 3.0 SP1 and 2.0 SP1, for backwards compatibility.

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It isn't a seperate version, it builds on 2 and 3 and can not exist without them. they are not included only for campatibilty. – pipTheGeek Jul 22 '09 at 11:38

It is an extension to .NET 2 and .NET 3. You can not have 3.5 without also having 3 and 2. Install 3.5 and any updates and sharepoint will be happy.
.NET 3.5 family update is available on microsoft update and is .NET 3.5 (which includes service pack 1 version of .net 3 and 2) and some updates on top of that to fix compatability problems introduced by the service packs.

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3.5 is both a separate product and an upgrade - if that makes sense.

The same install will either upgrade an existing installation or do a full install if there's no version already installed.

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As far as IIS is concerned, ASP.NET 2.0 3.0 or 3.5 use the same version of the CLI so they are undistingable

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