Do you have a GPG or PGP security key? You can expand your web of trust at the SCALE 3X Key Signing party. If you'd like to participate, you should bring at least one legible copy of your GPG / PGP key fingerprint. A picture ID is recommended, but not required. If you plan to participate, send your public key to keysigning@socallinuxexpo.org.
Some experience a newbie gained last year:
Some people can get picky, so the more legitimate forms of ID you can bring (and the more closely they match your email address), the better. Also, be sure to explicity state whether you want your key published to a public database. It wouldn't hurt to set an expiration date on your key either, to prepare for unforseen circumstances.