yes, I've done it with them many, many times. the mod takes my anni (ladder) in a game, and takes the other person's soj's (nonladder) in a different game. Then I go to a NL game and he gives me the sojs, other person goes to a ladder game and he gives them anni. The reason you can trust is that if someone rips you off, they get banned from the channel, and if they DONT rip you off, they get a 'vouch' which means everyone knows they haven't ripped anyone off so they can vouch for that person. So when you go in channel, get a mod to help you trade, and ask if someone can vouch for that mod.
the server I use is irc.dclone.org and the trade channel is #trade-east for east ladder/nonladder and #trade-west for west ladder/nonladder