I visited Myanmar ( Burma) last Nov 2013 with 2 of my friends. This is absolutely my favorite country in Asia.
Just a quick words to let you know how we got the Myanmar Visa online. I tried to contact 3 agencies after searching on google
1. www.myanmarvisa.com , they are very good, very easy to contact by phone and the person who answered our questions about visa was very nice also.
2. www.myanmarvisa.org , very responsive. We finally booked their service as they also work on weekend and during the evening time of Myanmar. They sent us the visa approval letter in 1 week.
3. www.myanmar-visa.org, it seems their service is more expensive than 2 others agencies mentioned. They do not have a phone contact so I just sent 1 email asking question, very slow response
I hope my post here gives you some clue to obtain Myanmar Visa online if you do not have time to visit Myanmar Embassy or consulate