What does bluez do, it screwed my bluetooth up and I couldn't pair with any mobiles or BT Keyboards.

what is bluez?
The overall goal of this project is to make an implementation of the Bluetooth™ wireless standards specifications for Linux. The code is licensed under the GNU General Public License (GPL) and is now included in the Linux 2.4 and Linux 2.6 kernel series.
http://www.bluez.org/

I'd refrain from installing on the N800/N810, it works well on my Ubuntu PC, but why I had it in the Aplication Manager and installed it I don't know????