As everyone knows — because we've been told so over and over — talk radio from the left side of the political spectrum is boring, earnest and dull. Unless you listen to Partisan Gridlock on KPFT-FM Friday afternoons from 3-4. Host Geoffrey Berg, an attorney, is funny and sharp; he gets good guests (from the right as well as left) and doesn't let them off the hook (again, whether they're from the right or left). Entertaining talk radio from a progressive view? Sure, Air America died, but its spirit burns on here in Houston.