Haven't seen much in the way of online postage advice here, so I figured I'd ask. I'm finally making my first foray into the world of online postage, and I bought the Avery Internet Shipping Labels with two per sheet (#8126). The box says they work with the major shipping services, but how exactly does that happen? Do I use one of their Word templates to do it? If that were the case, though, how would I handle something like USPS Click 'n Ship, which spits out a PDF? I couldn't print that using Preview without delving into custom sizes, since it doesn't recognize Avery labels...and besides, the dotted cut line that appears in the generated PDF infringes on the space of the adjacent label. Or is there some awesome app everyone's using that I'm not aware of that lets you create, buy, and print from all major services directly using their APIs? Help.