This has been out for a while, I don't know why I kept delaying linking to it:
ABI research has ranked the various femtocell vendors. Check the news release here.
Their ranking criteria is based on two aspects: Implemention and Innovation. This ranking is by no means a ranking of the femtocell prodcuts only. It also takes into account the overall position of the relavent company/division in terms of finances and partnerships. (you can see the criteria here).
Based on the matrix, ABI research has compiled a list of the top 10 femtocell vendors. The top 3 are: Ubiquisys, ip.access and RadioFrame networks.
One thing that surprised me is that Alcatel-Lucent is listed as number 4, which I thought is rather over rated considering that their offering oscilates between an imaginary concept or a modified picocell product ( not purpose built as a femto product from the outset). This ofcourse depends on who you talk to in Alcatel-Lucent: French or American.