I think that you have already know about Rhinospike.com.
I really like it and record new requests every week-end and sometimes even more often.
In return I need Arabic recordings, but there are only few Arabic recorders, who record not very often… (and quality is quite bad…) Of course the fact that I only give and don’t receive back what I want will not prevent me from either recording Russian requests or learning Arabic. But anyway…
If you are native Arabic speaker, or you have friends who are native speakers, please, join Rhinospike and record some requests from this queue: RhinoSpike : Queue