http://blueman.tuxfamily.org/index.php? ... &Itemid=56
Copy & paste from the official website (it was designed for Ubuntu, but works for Mint just fine):
Download repository for ubuntu 8.04:
First, open a terminal window (Applications->Accessories->Terminal). Then add the repository's key to your system's list of trusted APT keys by copy and pasting the following:
wget -q http://download.tuxfamily.org/blueman/blueman.gpg -O- | sudo apt-key add -
Next, add the repository to your system's list of APT sources:
sudo wget http://download.tuxfamily.org/blueman/hardy.list -O /etc/apt/sources.list.d/blueman.list
Then update APT's package information by running 'sudo apt-get update'.