Get OTR to work with bitlbee
Bitlbee has no native support for OTR but there are custom versions that include OTR functionality (sadly you have to compile your own bitlbee)
some versions that include OTR Support:
One current version http://github.com/abbe/bitlbee-otr
and its corresponding blog (?) http://wahjava.wordpress.com/tag/bitlbee-otr/
Original (outdated!) http://khjk.org/bitlbee-otr/