I followed the lead of others on the PHP Planet and added Phorum to Ohloh.com. They have completed their analysis and have determined that Phorum would cost $1 million to produce. Its probably would have calculated more because we lost our CVS in January due to a hard drive issue. So, we had to start from scratch.
According to their stats, I am the 3rd ranked contributer on my own project. For this year, that has probably been true. Maurice Makaay has brought lots of new ideas this year.