Bejeweled.
I've seen a few forums relieve slow portions/boredom with a forum high score table, so I figure why not here? Chat sounded bored, idea was discussed there, so here it is.
Feel free to post cooler games, but to start it off, Nanaca Crash (despite the anime crap) was a classic. You basically use mouse clicks and luck to launch a dude as far as possible while the game measures the distance, speed, height, etc. Here's my recent score to get us started. Screen caps would be preferable for score comparison.
Again, feel free to post other cooler games as long as they have a scoring system.
It requires installing. Not everyone might be cool with that.
Webgames just require having flash or java.
You can get power ups from combining the purple avoidance chick with some random versus mystery woman (counts as a special). One of them makes hitting the ground have you bounce like a super ball instead of bounce like a rock.
Otherwise, I just saved my bonus bike hits for when I picked up the most speed, and ended up landing on the Red chick multiple times from both luck and timed blue bike bumps (chaining her makes for some weird Samurai Special). That wasn't my first try, but I've seen much higher scores from others.
Edit: Not sure if it makes much difference, but I usually aim for the starting boost to be under 10 degrees as close to 100% power as I can. If it's one of the booster chicks as the first one in line, you get a decent boost while having the angle be down instead of up.
This video shows how luck is the largest factor, but also how there's a semblance of control over the outcome:
Edit 2: Just looked through old forum archives to find old scores. I apparently tripled my old score and beat that forum's old top score (by 3k) with that 39k... I thought I remembered those scores being much higher.
I doubt I'll ever score that high again. 
I've never played Nanaca Crash, so I can't compare scores with you.
One game I think it would be interesting to compare scores with is Audiosurf. I bought the game on Steam. It didn't cost much.
I haven't played it much, but if there were people here to compete with I'd play it a bit more often.
Those I am competing with for the highest score would have to play audiosurf using the exact same song I use and the same level.
I haven't played it in ages, so I'm currently playing on easy mode - Casual Characters (Easy) in Mono. The song I play to is Rampage by Skrillex.
Once I get used to the game again, I'll play it at a more advanced level again.
