WARNING with Solution: Nanobsd Snapshot June 11'th blocks all trafic out!
I just made a nanobsd 1g upgrade to my Alix with June 11 upgrade. (http://snapshots.pfsense.org/FreeBSD_RELENG_8_1/i386/pfSense_HEAD/updates/pfSense-2.0-BETA1-1g-20100611-1403-nanobsd-upgrade.img.gz)
Now all the traffic was "blocked" by my pfSense. I was able to access ONLY my default gataway address, witch is my adls modem configuration site. All other traffic is "blocked" or not routed correctly.
SOLUTION. Update makes one new default route with blank fields of interfece information ( System - Routing). You have to edit GW_WAN and make it as default gateway! Remove the false route.