This is my best one:
http://www.betanews.com/
I post a new release notice every 10-30 days and get about 25downloads/day while my notice is on their "new release" page.
This site gets my notice from betenews and runs a link that stays there for 3 days. I get... I donno 20 downloads a day for a few days.
http://www.majorgeeks.com/
This generates a lot of hits but not very many downloads. I have kinda bad Karma -- they know me
http://www.reddit.com/
Slashdot banned me
Digg is hopeless.
This generates a trickle.
https://sourceforge.net/
I live in Las Vegas and they're not worried about new casinos in other towns -- they figure it wets the appitite.
By the way, your debut is a huge deal. Use it wisely. My reddit debut generated 50,000 hits and 500 downloads.
There's another site:
http://news.ycombinator.com/
I no longer get noticed there.