Yes I have 4.4.2 running on my NSLU2 with no problems streaming to my Xbox 360.
I have problems streaming to my MP101's though. It plays only a portion of the track and skips to the next. Seems to be worse on the higher bit rate songs. So I guess its some buffer type of problem. I've tried farting around with the client settings e.g. MP101 RTP/No RTP which doesnt help.
Used to work with 4.1 before the web interface was changed.