I've seen a few screenshots around here that have galaxies with very few overlapping wormhole lines, a good number of planets, and a nice spread out layout.
I'm sometimes amazed by how long it takes mashing the "new seed" button to get one like that with what you'd think would be a relatively simple map type to make a clean layout for, like snake, but even those end up a zig-zagging mess that folds over itself in several places half the time. I suppose I can try to make an effort to note the nicer/more interesting ones I find, too.
Maybe a button in-game for saving the current seed and other settings somewhere that can be both easily reloaded if you want to play it again (or if someone else wants to) and that can be shared with other people would be useful. Much easier than copying everything by hand or having to take a screenshot of the stats screen, at least. I bet someone's already suggested it, too.
I've seen attempts at collecting lists of good seeds before, also on the wiki, I think, but while it seems quite useful, it doesn't seem to go anywhere usually. What would probably make it get a lot more use (but would also possibly take more work than it's worth) is some sort of "map database", possibly even integrated into the game, where people could submit interesting ones with a description, rate them based on various things (e.g. difficulty, whatever), and search for them. It could certainly be done outside of the game, too, as some sort of fan-maintained thing, but then it'd presumably only see use by the relatively small number of people who actually hang out on the forums.
I don't know. I'm just babbling rather than getting ready to go to the dentist like I should be. Heh. It does seem like on any non-trivial scale it would probably work best not as a forum thread, though, and you often need more info than just the map seed number itself to recreate what it is about the map that's interesting.