I've been using your kext for my Lenovo S10 (with a BCM5906). So far, it's been working great!

On your "not implemented" list you have:
BCM5906/M - Isochronous Send Ring

I was wondering what that actually means for us BCM56906 users? Do we lose any common feature/functionality?

Also, I get 6MB/sec when transferring data from the ethernet connection. What do other people get?