In reply to sethmford:
Not much at all on the Pic de Mide de Bigorre ! There is a long couloir on the N face, but that is a winter climb. I'd seriously consider going elsewhere !
As for the Aneto, the "classic" ridge route- graded AD+- is the "Cresta Salenques / Tempestades". I've doe it a few times, definitely one of the best outings in the Pyrénées.
More info here and a few other routes :
http://www.camptocamp.org/routes/137740/fr/aneto-arete-salenques-tempetes
There is a lovely spot to bivvy , at the lake, under the Col de Salenques. Many prefer to bivvy at the Col, but you then have to take all the bivvy material to the summit ! I usually bivvy after the climb, depending on how you move on easy ground it can be a LONG day !