rsync will not copy things that are stored in flash (things like current playlist and position, volume, and most other things that may be frequently changed). As to whether your config.ini is copied, I think that depends on how you configure rsync.
You might be able to clone your EQ settings, radio station presets, and the like if you rsync the players' unformatted data partitions. I've never tried this, though, so you could be a guinea pig...
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Toby Speight
030103016 (80GB Mk2a, blue)
030102806 (0GB Mk2a, blue)