The best way everyone will surely post is getting to kids at the middle school or elementary school level. Word of mouth has always been important to our team; getting our friends to join worked decently well last year without any concentrated or organized effort. This year, we need to expand a fair amount (we'll have 9 gaping holes in two years when my class graduates - and right now we're only 13 students
with two seniors leaving now
), so I'll be interested in what other responses people give.