just an fyi, there are no such things as seedless tomatoes.
there are some new hybrids that have relatively few seeds, but are not completely seedless.
i cut and squeeze out the seeds and mucilage much like andy described, but i don't get too crazy trying to remove every single bit. a coupla seeds won't be noticed in most dishes.
The way that you wander is the way that you choose. The day that you tarry is the day that you lose.
Sunshine or thunder, a man will always wonder where the fair wind blows.