It is definitely possible to use SharePoint 2010 beta 2 with TFS 2010 beta 2. You don't even need to do a lot of work to get them working together. A few things to consider: SharePoint 2010 beta 2 must be preinstalled (either on the same or separate machines)
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If you want to install and configure SharePoint 2010 in a standalone environment, but you do not want to use SQL Express and/or if you it to run in a workgroup environment, by default SharePoint 2010 configuration wizard will not allow you to do that.
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