Wouldn't it be great if you could choose "Package Solution" on the Solution node in the Solution explorer and that Builds and packages all projects within the solution (not deploying).
This function should have two options:
1) Package all projects as normal (default)
2) Package all projects and copy all solutions to a Deployment folder
This would make it very easy to source control all packaged WSPs and also make it easier to have all WSP's in one folder when copying to staging/prod servers as well as a folder which you can use when PowerShelling.