There's a TMS for Poland with traces as of June 2012:

  tms[15]:http://zverik.osm.rambler.ru/gps/poland/{zoom}/{x}/{y}.png

You can also download an archive (warning: 1.1 million files!),
unpack it, for example, in C:\tiles and use the following TMS link:

  tms[15]:file:/C:/tiles/{zoom}/{x}/{y}.png