Google's Base is one of the least-ready products they've ever launched. Did they not foresee that it would be massively appealing for spammers? Or maybe they did? It happens to be down right now, as I write this billet-doux. (It was out for about 3 mins total...)
Here's what the best use for base is: A spam honeypot. Google should basically take the logins of everyone who's uploaded more than 50 items, do a big WHOIS grep through their registry database and penalize every one of the websites of the uploaders in the main search index.
In other words, the only people using base so far are affiliate and porn spammers. Google could use that knowledge to increase the quality of its index spam filtering.
Just a thought...