Edited the first post to add the information about the OndioFM - be carefull, the OndioSP does not have recording capabilities at all, so no microphone and no line-in.
Added info about the Archos Recorders - additionally started a new part for the s/pdif digital input of the V1 Recorders... Maybe the V2/FM Recorders have that too but this needs confirmation of someone else.
Also added M5 to the "has line input" list because it technically works the same as on the X5 - you need the so-called "subpack", a special connector with all the jacks. The only difference is that this subpack is not included in the standard delivery as it is for the X5.
May I ask what you need this for?