I sent him 10 LTC and he was supposed to send me 0.35 BTC. He has not done so up to this point. Here is proof that I sent him the 10 LTC:
Status: 15 confirmations
Date: 5/2/2013 21:35
To: arobinson LNrszN4krgLeoE9aDV83z97zPQSQby5NYJ
Debit: -10.00 LTC
Net amount: -10.00 LTC
Transaction ID: 73bcf8329ac9301edaf04198205d4712b891a51a1244409fac9a9b5199d13136
http://explorer.litecoin.net/tx/73bcf8329ac9301edaf04198205d4712b891a51a1244409fac9a9b5199d13136He is not responding to my e-mails either. If he clears this up, I will update this post.