Maybe go the international route: Offer a clear and simple pool interface in as many languages as possible. Not everyone interested in mining speaks the level of english required to understand a pool frontpage.
+15 000 000 000
Deepbit have all the Russian and Chinese miners on his pool, because his pool is the only big pool that offers those languages. Don't wonder why he's so big.
Check the countries that have a mining potential (like low electricity cost), check their languages, and offer a pool in that language. As an example, province of Quebec in Canada is around 85% French, with 7 cents KwH, winter and with a population of around 8 millions. If you're the only pool offering French language, chances are good that you'll get miners from Québec.
I think that Spain is also a low electricity cost country, so Spanish could be another interesting language. Do your homework