it would be nice to link a twitter handle, portfolio url, and a magento account to the forum account so we can more easily contact other members. a custom avatar (or gravatar implementation) would be nice so we can personalize our accounts.
another good idea would be to flag if specific members are certified (and perhaps which certification) with small icons next to their avatar (linking back to their main magento account for verification/security). this will also aid the poster in determining if the reply is coming from a trusted source and is credible. it'd be a nice touch that stackoverflow will never implement because it's magento-specific.