I something like SMBLib used in komodosoft's WP7 app sharefolder + NetBIOS computer's presence detection with name resolving.
I don't care how the lib is written - whether it's reverse-engineered one from sharefolder, or ported JCIFS/SMBLib or written from scratch. Also no native code allowed - such lib must work on WP7
Primary criteria - is cost, reliability, time to develop(in that order).
Feel free to ask additional questions before bid. I did some research about SAMBA/CIFS, NetBIOS, UDP sockets on WP7, and other technical stuff.