[headsclouds]

We have a web application out in beta (free) that integrates with Gmail, called Funnel http://funnelnow.com/ aimed exactly at people like yourself (and us, since we developed it for our own needs primarily).

We've finished the integration of the complete new UI (take a look at some screenshots on our portfolio http://sprawsm.com/project/funnel/) that we will be releasing in a few days.

We've been using it for over two years now for our design company, worked wonderfully.