"I’ve read the little background material on Google’s Base and still can’t see whether the material you put there can be found by other search engines. I also cannot find evidence of an API that shares any standards for tags and structure. Is Base open or closed? So far, closed."
"I wish I were hearing more noise from the microformats guys to act as competitors — or at least as pressure on Google for openness and standards."
Google Base seems like a roach motel for your data. Its not Google's data - its your data. Danny has some thoughts on this.
Apparently, the answer is put your data on the web. The question remains, what will eBay's and database companies response be.