Well, since Dirvish was nice enough to make a section just for me and my abundant worthless knowledge I guess I should post stuff here. So, without further ado, a little tid-bit about beer.
"IBU" stands for International Bitterness Units and is a measure of how bitter the brew is relative to other brews. "OG" is Original Gravity, and measures how much heavier than water the wort is before fermentation (and thus how much sugar is present). FG, or Final Gravity, is rarely listed, but it shows how much unfermented sugar is left at the end. If you subtract FG from OG, you can calculate the exact alcohol content of the finished beer.
Now you can thank me when hot women/men at party’s think you're of high intelligence.
-MrHodes