sid-support is a simple package for installing the sid mimetype (audio/prs.sid), sid icons, and the gstreamer plugins. This does not provide any players and the n8x0 "built-in" player probably does not play sid even with this package. For a sid capable player, see e.g. kilikali.
If you don't know what sid is: Repository for sid-support:Web address : http://tuomas.kulve.fi/debian Distribution : chinook Components : maemo
Or check Maemo Downloads for single click install.
These are all compiled without ARMv6 spesific options.