I threw together a matchmaking service based on the OP's premise. http://makermatch.herokuapp.com You sign up as either a 'Maker' or an 'Investor/Co-Founder/Other'. Makers post their idea and investors can click on the maker's name and send them a PM if they would like to start a dialogue. I started to set it up so that Investors can bid on ideas but haven't implemented that yet. If this is of interest to enough people, I'll work on it some more tomorrow and make it a bit more robust. Would be pretty cool if any new products/investments/co-founder teams come out of this.

Shoot me a message if you have any thoughts on what I should build into it.