I keep my reference book handy for the playtest materials. Also, there was a pretty slick full page card that came with Orion Attack that had all the current weapons on it (sans playtest weapons).
Buy the new reference rulebook. It's fully updated with every rule that's been published to date, has all of the rules corrections, and even has the playtest rules for the Vudar and ISC weapons systems.
I won't post that information here as I certainly do not want to take anything away from ADB. However, you can purchase one of those reference cards from ADB at their storefront for 50 cents. Probably some postage in there and then shipping time, but sounds like it would serve you well.
You know, this was itching me at the back of my mind as I thought I saw this somewhere. And sure thing, in Commander's Circle. If you go to Resources and then Play Aids you will find current Master's Weapons Chart you can print off. That's pretty slick!
Kahuna - Good point about the downloaded MWC, but he would still need the rules to go with those charts. I agree, the Reference Rulebook would be the cheapest way to get those (and it's a handy thing to have, period).