[Tilecache] multiple tile requests

[Matthew Rushton]

Hi,
  I was curious if anyone has used/modified TileCache to be be able to request multiple tiles at once. The need to do this has arisen because of the extremely high latency on mobile phones (for example the iPhone maps app requests multiple tiles at once using a proprietary request format). Http pipelining is possible but it requires too much work on the client side to get right, and on some platforms simply won't work. Any thoughts on this? I was planning on writing my own apache module to do this but figured I would ask. I think an API involving multiple tiles makes sense, especially in the mobile/high latency world. Thanks!
-Matt