http://www.bike24.de/manufacturers/Shimano.html
If you scroll way down, you'll see the groupsets. I know at one point, I posted that link and some people posted other links where prices were slightly lower. But, you'd have to click on my over 500 messages to find it I guess. The prices for customers outside of Europe of course is slightly lower due to the fact they take out the VAT.
But, yeah, it's a pretty interesting idea. I mean I calculated once if I bought Handspun wheels with Deore LX hubs and Velocity rims, a Nashbar touring frameset and a Deore M590 trekking groupset, it might only cost me around $720. But the Shimano Deore LX trekking group is also available.
I like the V-brake groupsets but sometimes wonder if the disk brake groupsets are really worth it.