I've been pondering an IRLP (or PLRI) daughterboard for the Pi. As some of you may already know, the standard V3 IRLP board can be attached with a ribbon cable connecting to the P1 header. Then you attach a USB sound card to a USB port. What I propose to do is have a daughterboard plug directly into P1, add a line for DTMF strobe (so D can be decoded), and maybe add an RTC.
Has anyone else considered building something like this?