The problems with getting TFS Workgroup Edition from MSDN Subscriber downloads should now be resolved. It has now been made available to all appropriately licensed subscribers and should show up in your list of download choices. If you still can’t see it and you believe you should, let me know and we’ll investigate.
Sorry for the delays. I can’t say I fully understand the logic but in an attempt to limit the download spike in bandwidth, they scheduled the availability of various product downloads over the first week after RTM.