If you want to find sites to submit to, AdWords.com, googles ad service, might be of assistance. With AdWords, you can use certain tools which will tell you web sites that match certain keywords, and it provides quick links to them so you can check them out. So you could put "shareware" into that and it would give you a list of websites which google thinks would be approptiate sites to run ads with that keyword on, and you can actually see an approximate count of how many impressions those websites generate, and use that to whittle your search down to those at the top of the list and then try different game related keywords to find more. You'd probably have the most luck searching for actual game titles for popular games with this method.
This tool is avalable when you create a "site targetted" campaign. And it doesn't cost anything to use it.
This tool is avalable when you create a "site targetted" campaign. And it doesn't cost anything to use it.