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Originally Posted by Sscamatt
Quick Overview:
802.11b = 11mbps, fair range (most popular, widely used)
802.11a = 22mbps, less range than b (came as a faster solution to b, not very popular, only advantage it works on the 5.8GHz band vs the 2.4Ghz band for all other specifications making it less susceptible to interference from microwaves and cordless phones, (but with 11 channels to choose from in the 2.4ghz range im sure you can find one thats not being used.)
802.11g = 54mbps, better range than b (backwards compatible with 802.11b, 802.11b devices can connect to 802.11g, so best choice for upgrading an 802.11b router with multiple computers.)
Super G (802.11g) = 108mbps (not truly 108mps) , range comparible to regular g
and the new weapon:
802.11n = 108mbps+, super range (backwards compatible with 802.11b, and 802.11g, making it the fastest and most versatile solution in the future, no IEEE standard set till mid-2006, but draft devices are being sold as "pre-n" now)
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802.11G and B both operate in the 2.4Ghz spectrum, making them vulnerable to interferance from 2.4Ghz cordless phones (most recent cordless phones are 2.4ghz) as well as microwaves. 802.11A is in the 5.8Ghz spectrum, meaning that those newer 5.8Ghz cordless phones interfere with it.
Usually you can minimize interference with channel settings, but I still notice a drop in signal strength (or total loss of signal) whenever someone answers the phone on a certain handset in my house.
Be wary of Super-G devices. It's not a IEEE ratified standard, so you're apt to get some variations from manufacturers. Best to stick to stuff that's standardized.