PC Gamer UK - The best of the PC gaming mags.
PC Zone - The oldest games mag in the UK - (I bought UFO:EU/XCom because of the PCZ review. Happiness everlasting.

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Custom PC - For the time when my fiancee allows me to buy a new PC, and I'll build it myself.
PC Format - My least favourite. It is a halfway-house between a hardware mag and a games mag. It does good reviews of hardware, but lacks the nerd-kudos of Custom PC. The gaming side, not so much. Plus they stick pics of women in bikinis on the cover, which makes me too ashamed to read it in public. I'm too old for that sort of thing!
Total Gaming Magazine has just come out, which is similar to PCF, but doesn't seem to have a particular voice yet. I'll give it a couple of issues. Brave of the publisher to release a PC games mag in the current climate, so they deserve some support.
SFX - Best sci-fi mag on the market.
Traithlon 220 - I love doing the sport, so I like to read about it.
Runners World - I run, so I get a magazine on it.
I read the odd science mag too, Wired, Sky At Night, Focus, Scientific American, etc, but these are the ones I get regularly.
As you can see, I like to read! I get a load of mags. It helps to make the commute go faster.
J