1675, a bit better then my blitz rating. Besides terrible graphics, this test seems legit. :)
Determine Your ELO - What's Your Skill Level?

Got 1890, but that's definitely too high. I'm moderately good at puzzles, but not so OTB and under pressure. Nice how they included an endgame in the test, though.

1...Bxa6
2.hxg6
3.Rxg6
4.Bxf7
5.Nh6+
6.Bh6
7...Nh7
8.Bd8
9.Bxh6
10. Qd7
~10 minutes.
At #10 I originally thought it was white to move and decided to improve the bishop via d2. Then I started typing this and noticed it was black to play and managed to increase the rating by 100 points.
1870
[Edit: Listed above are not the answers but my personal choises along with the outcome]
[Further edit: I just noticed the disclaimer saying that checks are not made, so #5 is probably a dud]
So I took this test several months ago and got about 1600 when I was clearly much weaker and I took it just now without remembering any of the puzzles and got about the same score so I'd say it's not very accurate considering how much better I've actually gotten over those few months.