I am probably going to go with eSellerate for my alternate purchase system. I consider there two be two different categories of sales. There are the sales where people come to the DEXplor website directly because of DEXplor being reported on news sites, forums and word of mouth. Then there are sales that originate from someone finding the product on a site like Handago or PocketGear while looking for a solution in general. DEXplor is pretty cutting-edge, so it generates its own news and draws people to it of its own merit. 95% of my sales have been from people purchasing directly through my website using PayPal. Those sales are most important to me, and I do not want to send them to a place like Handago or PocketGear because they absolutely don't deserve any percentage of those sales. Now if I list it on Handago, and it sells hundreds of copies because a lot of people go there to look for software, than I feel there is justification for them to make some profit. I very well may have not got those sales in the first place because competitive products are available at Handago, and the customer would have been ignorant to DEXplor's existance. However, I won't send people to Handago from my website.
I have been in contact with eSellerate for a while now (they have been trying hard to get me to start selling my product through them

). They charge 10% to process an order. PayPal costs me only 5%, and it is still my first choice for that and other reasons. I would encourage other developers to follow suite, and have a purchasing system that allows them to keep a higher percentage of the profit for sales originating from their own website. When I think of products like Snails, which are big hits and generate a lot of news, I feel certain that a HUGE number of their sales at Handago originated at the snails website. They could have kept 90% of those sales using a company like eSellerate to process those orders.
Ha, I just thought of something else. Most Pocket PC products these days (like DEXplor) require that the purchaser install the "trial" version on their device first. The customer then has to go back to purchase the software using a Product ID provided by the software. Well, on the DEXplor "unregistered" screen I tell people to go the the DEXplor website to purchase. Thus even if a customer found DEXplor on a site like PocketGear or Handago, they are still very likely to trial it first, and may well follow the instructions provided within DEXplor to go to my site for the actual purchase. My plugins are only downloadable from my website, so they have to go there no matter what. Heh heh heh.
Here's eSellerate's site:
http://www.esellerate.net
Dan East