hey lambosprit, I'm actually happaned to do the same type of plugin, so some one on my page recomended me to combine forces w/ u and I think that would be a good idea.
I have good knowlage of AT commands and that was my original idea to controll phone and use default headset HS profile. But that didn't work as one of the most popular phone (iPhone) does not support AT commands

so I switched to BS.
Unfortunatly for me BS did not have .net samples so I wondering how did you get it working in .net, did you use C++?
Do you want to work togather on this project?
PS: BS 6.2.xxx.x and up has support for Phone Books via AT commands. BS 6.4.xxx.x has added support for Windows Mobile phone books but you need to install extra soft on the phone.