just used Endicia for the first time. they have a one month free trial and i'm trying to move some used books this month so i thought i'd save myself some trips to the Post Office.
the software is pretty niffy though it took a lot of wasted envelopes to find the right settings and placement for my brother printer. i have a scale so once you input the weight it tells you what the postage should be; saves me going to the USPS website for rate info.
i don't do mailing enough to make it worth $16 a month but for those who do, it is pretty convenient. when the month is over i'll go back to using it's free predecessor Swordfish.