All the people that say "You can't buy anything with it, it's worthless" or "it's too volatile to be of any value" are missing the forest for the trees.
The simple fact of the matter is that even on the most fundamental level, bitcoin takes Visa/Mastercard/Amex/Discover/PayPal and all of the associated fees out of the equation. If you buy something in bitcoin you're saving the merchant anywhere up to 5% of the cost of goods sold which, in turn should reduce the price you pay. The price may be volatile at the moment, but it is certainly by no means undervalued given the size of the potential market. Buy some coin by transferring money into an exchange and buying them (might cost you up to 20 bucks and 0.5% in fees) or buy them in cash for "free" with localbitcoins.com and just don't spend them any time the price is lower than what you paid for them. Alternatively, provide a good or service and accept payment in bitcoin yourself.
The fact that bitcoin is peer to peer and run by the community should be enough reason for any Slashdot user to take a serious look at it now that it has received enough scrutiny to know that the math is safe.