Originally Posted by Silverwind
These sort of keyblocks is present on any keyboard (afaik) and is a hardware issue. It's just that each keyboard (or manufactor) has blocks on other key combinations. There's no way around it except buying another keyboard. My Logitech Wave for example has a nasty block on A+D+3.
Here's a tool to check for such blocks: ftp://ftp.digitalgenesis.com/pub/keyscan/
I would gladly take any recommentations of keyboards with less or no blocks 
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The problem you're describing is also referred to as having low "rollover" (
Rollover(key)-Wikipedia). I PvP pretty competitively, and I got sick of executing some ninja-quality actions in arena with strafe+forward+jump+modifier+randomkeybind, then failing anyway because my keyboard refused to register certain key combinations. Having a movement key not register is definitely the worst, especially when you're pillar kiting a melee class.
This led to me searching for the most reliable keyboard I could find with 6-key or greater rollover. I settled on a
Das Keyboard after purchasing a G15 revision2 and returning it to the store the next day due to how awful and unresponsive the keys are on the redesigned (orange backlight) version (It may have been redesigned again since. My original post about it, and my first impressions on the Das Keyboard, are here:
WoW and the Logitech G15 Keyboard - Elitist Jerks).
It's been almost a year now and I'm very satisfied with the keyboard, even with the $100 price tag (I got $30 off since I pre-ordered). Users of IBM model M's are likely to be pretty pleased with it, and it has TWELVE-key rollover. I've yet to find a keypress that does not register without pressing more buttons than I have fingers. If you want a sturdy, reliable, no-frills keyboard that won't fail you, and you have the cash to blow, get a Das Keyboard.