I was already thinking about a site like that, but a completely different system

My idea: Something like an exchange
1) Both sides will create a profile
2) They will choose the person they want to trade with
3) They will choose the currency (each side another)
4) They will input their wallet address
5) They will send the amount of coins requested by the other side to a address proposed by the site
6) In meanwhile, the other side is doing the same thing
7) When both transaction person=>site are accepted by the site, a big green button will appear : "Are you sure do exchange XLTC for YBTC with PERSON_Z?"

If both sides accept this, the money will be send automatically to provided addresses (transaction "site=>person")
9) There will always be a big red button "stop the trade" and both sites will be refunded
Unfortunately I don't have time to make it work right now, so feel free to use my idea
I like the idea, it's basically just an automated escrow. The only problem I see is that with the rate that new coins get made and then posted to exchanges, it would be kind of hard to keep when you would have to code and test for each new coin made. The way I envision it, I troll around on these forums a lot, but not constantly. The second a new coin goes live, someone acting as an escrow could edit their profile to add that coin as one they do escrow for, therefore in essence, "decentralizing" the escrow process away from me. I would just be providing the platform for people to use to communicate more efficiently and safely then trying to wade through all the posts on here.