Comics based on jokes that have been kicking around since Reagan was in office (i.e. Lay Jill or Jack Off) have a big handicap to overcome. I'd rather see more observational humor, myself.
This Job Sucks was good, but I notice that the dialogue could have easily fit into just two panels. That would have given you the opportunity to use the first panel to set the scene (the nervousness of the job applicant, the calculating coldness of the interviewer, ect). The punchline then would have paid off even better.
Love Connection was perfect. An old theme, but never done better.
Letters to Satan had a truely great premise and a decent punchline but suffered from some redundant narration. Better to let the dialogue set things up wherever possible.
That said, Uncle Ted had a floating Gabe because you stuffed too much dialogue into the preceding panel (causing the frames to stretch vertically). Since most people won't take the time to read that much dialogue anyway, its a good clue that you need to tighten things up.
Overall, though, I'd say you're off to a pretty good start.