Discovered Guayadeque recently. Really nice player especially the intelligent playlist is such a joy.
What I would really like to see is support to store song ratings etc. using FMPS standard, that all written tags are visible within other players that support this standard.
Players that (planning to) use FMPS tags are: Amarok, Ampache, Banshee, Quod Libet, Songbird,VideoLAN, XMMS2, Youki, Clementine
It would be really nice if you support the tags and it would help people from the players above to migrate to Guayadeque without retagging the whole collection.
http://gmusicbrowser.org/faq.html also already uses the standard: you can enable the saving of ratings and play counts in the tag (using the fpms standard) in the "Fields" tab of the preferences (Note that it requires a restart, and only affect future changes, to write current ratings and play counts to tags, use the "Update tags" button in the "Tags" tab of the preferences).
this is what I currently use for my ratings and It would be great to have portability. would love to make the switch but I am stuck