Any form of information or idea that can be sufficiently compressed into search terms via Google, such that the results yield contextually appropriate hits.
Basically any internet venture, be it idea, website, service or anything elsegenerally related to IT that is popular or innovative enough to have the potential to be bought out by Google inc. and be assimilated as a googlet.
One cannot always predict what is googleable or not. But if it sounds like a good enough idea, one can bet google wants it.
youtube, blogger, feedburner, doubleclick, even fucking adsense and the famousgoogle maps.
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Bob: omg guyz i think i just had a googleable!!!1123
uberunderdarklord1985: zomg quickly buy the domain name