Hi! As the person who approves all of the ads over there, I thought I'd add a couple of little points to this :-)
We get some great ads over there, but I'm always surprised that the number of people who submit ads that don't have the most obvious point in it - a link to your game! I'm sure that nobody who's come here would make that mistake, but so many people do!
Also, another thing that lots of people do is forget that we're not on lj/ij. A lot of ads have the lj/ij specific justforeverme html tag in them, and of course, when you're off those sites, it just doesn't come up - so remember to change your links to the longer version.
Other than that, I try and approve as many as I can, and those I can't I'll get back to you with what needs to change. The other major issues we come across really are people putting in a feature graphics that's not the size we ask for - the site's set up to auto-resize things, but what we end up with there is a graphic that looks really, really bad, which isn't a good ad for your game, so usually I ask people to change it.