I do think it's worth noting, though, that the majority of people being cited here for "breaking through" aren't breaking through as POETS, but as actors or by having their work be used by the film and advertising industries as demographic bait or soundtrack background. The more we focus on celebrating that aspect of "breaking through" (it's a legitimate one, and some of the folks listed here are friends of mine, so I don't want this to sound like I'm not being supportive of their or any other poets' hard work and good fortune), it seems to me, the more we perpetuate the idea that the main function of "slam" is as a stepping stone to success outside of the poetic world.
There are examples -- a growing number of them -- of slammers who are making it INSIDE that world too; think of Cristin O'Keefe Aptowicz's success with "Words In Your Face;" of Patricia Smith making it to the National Book Awards' finals ceremony as noted above; of the many poets who are making more than a subsistence living on the college circuit; of the growing success of Derrick Brown's Write Bloody Press as an outlet for page work by folks from the slam community, coupled with successful and relentless group tours showcasing that work; of those of us who were featured in the influential journal "World Literature Today"'s article on performance poetry world wide (disclaimer: I was among those, thanks to PSI President Scott Woods who wrote a valuable article for the issue on slam); of Ishle Yi Park's poem being in "The Best American Poetry" a couple of years ago; of Victor Infante's powerful online journal of politics and literature "The November Third Club" and the work of all those people who are moving beyond the three minutes on stage to publish and perform in new and exciting ways with longer works, with musicians, with one-person shows...the list goes on and on.
The community is growing up, and while fame and mass media exposure are important to that growth, it's good to recall that there is lots of success happening right back in the poetic and literary trenches, too.