What is Barter? Why is it not described on the site?
It would be useful to list the number of users each project has.
It would be useful if you (eventually) split the list by price.
I don't have any money but I'd be interested to look at the new offers up to 1000 usd others might limit their interest to things over 100 k.
I will probably forget to visit your site. You should have a box where one can get an email with new projects from X to Y usd.
And an rss feed or json api that can be configured similarly.
http://borderline.biz/rss/0-1000
http://borderline.biz/json/10000-100000 etc
Have endless auctions, take 1% deposits for bids, let the thing run until the developer accepts a bid.
Have a widget with the highest bid for the project for the developer to embed in his project, linked to bl.
Give each project its own page/permalink on the website.
Good luck