Hi Abhi,
well some Tile server have a usage policy, so make sure you respect it.
We already had apps that crashed our platform caused by a to high load.
http://wiki.openstreetmap.org/wiki/Tile_usage_policy
http://wiki.openstreetmap.org/wiki/TMS
http://wiki.openstreetmap.org/wiki/Tileserver
http://wiki.openstreetmap.org/wiki/Featured_tiles
A own server would be a very good idea, see
http://wiki.openstreetmap.org/wiki/Mapnik
I don't remember a ready to use solution for vector rendering, but check
this out
http://wiki.openstreetmap.org/wiki/Develop/Frameworks
bye
Matthias
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