OK- so just in case I'm not the only person who didn't know this- it seems if you put tape over a postage stamp it voids it. I had bought a flat rate envelope to mail some swap blocks earlier in the week. The clerk put the stamp on the envelope, and I took it home to fill it later. Well, the blocks were a little "fat" in the envelppe so I sealed it with clear packing tape "just in case". Because I covered the stamp the post office would not accept it. I couldn't peel the tape off without ripping the stamp, so I had to re-buy the postage. Those of you that host the swaps need to know this for the people like me that enclose the flat rate envelope with the postage attached. Thanks for letting me vent!