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There is a guy that does this every few days:
It can be easily blocked if you add an automatic spam detector, and have the moderators or people with 50000 reputation the tools to add spam patterns to that detector list (for example - that dude's site address.)
Just an idea
My [delete] key still works just fine ;-p
The problem with automated filters is that you end up in a war of subtle tweaks, and it isn't hugely beneficial. Those answers take almost no time to deal with manually. Just keep flagging / voting / etc. By now they easily qualify for nuking from orbit, so just add your flag => require moderator attention and quickly vacate the blast area...
We may implement a blacklist of some kind (this typically means URLs, since they are almost by definition unique) but to date it hasn't really been necessary.
The community is the spam filter.
When/if there are six (6) flags on a post, it automatically gets deep-sixed from and by the system.
If it's egregiously persistent then there are other measures such as IP blocking.
