Stefano Sanna released in the past days a new version of his Bluetooth API for Android, the version 0.2. Some of the changes compared with the previous version are:

• Bug fixing for RSSI (signal level of discovered devices) and I/O management;
• SDP support to discover the RFCOMM channel assigned to a specific service  of a discovered device

These are added to the first release features:

• Chance to start and stop the device Bluetooth;
• Discover of the remote Bluetooth devices;
• RFCOMM client connection

The library is available from http://code.google.com/p/android-bluetooth ed e’ distribuita con licenza Apache 2.0. It has been tested on Android 1.1 and 1.5 and it doesn''t require any hacking.
Link to Stefano Sanna blog