Go Beryllium was my first game to use an online scoreboard, and it's been very informative discovering how people play the game.
It uploads a high score entry for everyone who plays the game, if they're connected to the internet. Although the scoreboard only shows the top 20 (
http://cokane.com/games/beryllium/highscores.php) I keep all submitted scores in the database.
Here's some interesting figures...
Since the game was publicly released about 2 weeks ago it has been played by 450 people. (2,000 viewed the trailer on YouTube).
17 people lasted less than 30 seconds and then gave up.
The lowest score so far is 5 seconds.
30 people have completed the game on easy mode. (13% of players)
2 people have completed the game on hard mode. (less than 1%)
90 people played with inertia turned off. (20%)
12 people in the top 20 played with inertia off. This suggests that either good players prefer inertia off, or turning inertia off makes you score higher - however the top score score is set by an inertia on player, so it's not exactly conclusive.
Most of the inertia off scores were submitted immediately after I posted the game on the shmups.com forum

So in conclusion - I highly recommend recording stats for your game with an online scoreboard, you'll learn a lot about how people are playing your games. The source code for Go Beryllium (including the php script for the online scoreboard) is available
here.
Here is the tutorial which I used to learn how to do online scores.