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I hear everything and more about TDIs is there. Never checked it out myself though...
We did have a discussion about VWoA warranties with B100 or B20 use, on that specific site a while back. Basically, (and I added more fuel to the flame, by calling VWoA myself)...if the problem was caused by Biodiesel...kiss your warranty goodbye. THe reason I got from VWoA, which is plausible, is the lack of quality control standards in the US, even though there is a ASTM standard for biodiesel, both B100 and B20. Even with the ASTM standard, no one is enforcing it. In germany, for example, there's only about 3 suppliers of biodiesel, and they are federally regulated, TUV standards or something for quality control, thus VWaG supports biodiesel there. Another example is there were people who got bad batches of "yellow brand" biodiesel and had problems with it. It was a backyard operation, which whatever biodiesel the guy had leftover (from farming equipment) he sold. Some got a bad batch, others didn't.
There are people on that site, and others around the country who make Biodiesel themselves and used it, successfully. If you do a search on the Sierra Club, there was a member who did a demonstration at an Earth Day on making your own Biodiesel, for her Golf TDI.
If you're not an apartment dweller like I am, and have a garage, you can get B100 delivered to your home like natescape.
When the next 20,000 miles rolls around...I'm buying it online and saving about $20 for filter.