It wasn't by my doing, but I'm glad it's finally working. The XO laptop from OLPC now has PSK31 available for ham radio operators. Talk about a niche!

Jerry Dunmire, KA6HLD, finally got Fldigi working on his XO and bundled the program as a stand alone activity. For those of you with an XO of your own that want to try out PSK-31, here are the steps included in his HOWTO:
First you must enable the DSP on the laptop:

login as root: su -l (that's a lower-case L, not a 1)

echo "/sbin/modprobe snd-pcm-oss" >>/etc/rc.local

reboot for the changes to take effect

Once you've rebooted the XO, download and install the activity:

Start the browser and enter the URL: http://www.dunmire.org/olpc/

Click on the FldigiActivity-1.xo link

Wait for the download to finish

Click on the Open button

You should now have the Fldigi activity on the right side of your Activity toolbar. Enjoy operating PSK, see you on 14.070 MHz!

For detailed instructions, click here to read Jerry's HOWTO. Or, if you'd prefer to do it manually (with no Sugar launch icon) there's a HOWTO by yours truly, here.

update: First contact made via XO with WI4USA.