128 96 146 142
Every once in a while, I get bored, and take an IQ test. The 128 is from a shareware program when I was 12-14. ~96 was around 2000, ~146 was 2004 (I was interupted and simply randomed the last question wrong, no doubt lowering my score tremendously), and the 142 is from today (Tickle.com).
I've never particuarly liked IQ tests, but maybe taking a bunch at different times and taking the inter-quartile mean would be semi-accurate. If it really matters though, have yourself evaluated in multiple areas by an expert.