I think I've seen all of Jeff Lieberman's horror movies: "Squirm," "Blue Sunshine," and "Just Before Dawn." I, too, first saw "Squirm" on "MST3K." I didn't really form an opinion on it because of the distraction of the commentary. I later saw it at an all-night horror movie marathon, however, and enjoyed it for its camp value. And it does feature a pretty cool effect. Too bad the budget didn't allow for more of the same type of effect in the scene on that lake.
I thought "Blue Sunhine" was interesting but not that strong of a movie. I bought the DVD and liked his anti-drug short movie "The Ringer" better.
And I really like "Just Before Dawn." It has good atmosphere. Compared to "Friday the 13th," I wonder why Sean S. Cunningham's slasher spawned so many sequels and Lieberman's didn't, anyway. I really hope the rigths to the movie are cleared up pretty soon and the movie's released on DVD--and given the royal treatment. A commentary would be nice.
I'm really looking forward to seeing "Satan's Little Helper." That and Frank Henenlotter's movie for Fangoria, "Sick in the Head."