Some of the services that I really love, and feel free to suggest others that you like are:
1. Coinapult (not available in the US, unfortunately), but I used to work for them, and helped build their locks product
Used them to send coins more than a year ago, total disaster, bitcoins went missing, had real trouble to sort things out with the party that should receive coins. Highly NOT recommended, use with caution.
A lot has changed in a year...I would recommend taking a look again.