alika - 1:17 pm on Mar 30, 2010 (gmt 0)
Do you use the Google URL builder to create custom URLs that GA can track? We found that using that significantly increased the Twitter referrals being reported in GA -- from a few hundreds a day to a few thousands.
The Snip-n-Tag plugin in Firefox easily creates Bitly shortened URLs with the GA utm codes added. This makes the creation of URLs that GA can track a breeze.