There are around 2500 hotels in Paris; feel free to book a room where you want (you can use the Pages Jaunes, which also gives maps and telephone numbers). However, we have warned the following hotels about our meeting, and they are ready to receive small groups (~15 peoples). You have to add 6 euros for breakfast.

Name	Minimal price (single/double room)	Address	Telephone
Hotel Tolbiac	22E/30E	122 rue Tolbiac	33 1 44 24 25 54
Hotel Sthrau	28/34, 36/43, 42/46		33 1 45 83 20 35
Amhotel	60E/70E	96 avenue de Choisy	33 1 44 23 22 02
Grand hotel de progres	27E/57E-	50 rue Gay Lussac	33 1 43 54 53 18
Hotel Devillas	70E/70E	4 boulevard Saint-Marcel	33 1 43 31 37 50
Hotel du Bresil	65E/70E	10 rue Le Goff	33 1 43 54 76 11
Hotel Andre Latin	84E/84E	52 rue Gay Lussac	33 1 43 54 76 60
Home Latin Hotel	75E/91E	15 rue du Sommerard	33 1 43 26 25 21
Hotel Comfort Inn	89E/119E	56 rue Mouffetard	33 1 43 36 17 00
Carofftel Gobelins	59E/70E	18 avenue des Gobelins	33 1 42 17 47 47
Familia Hotel	68E/89E	11 rue des Ecoles	33 1 43 54 55 27
Hotel Cluny Sorbonne	90E/90E	8 rue Victor Cousin	33 1 43 54 66 66
Hotel de France	65E/74E	108 rue Monge	33 1 47 07 19 04

Useful sites:

icipartout.com (maps and lists of hotels)
ismap.com (maps, very slow)
annu.com (maps and telephone numbers)
les pages jaunes (maps and telephone numbers)

Here is a sketchy map (M=metro stations, IHP stands for Institut Henri Poincaré, where the conference holds). Note that the IHP is very near (=5 minute walk) from the metro (in fact "RER B") station "Luxembourg" (direct line to the Roissy=Charles de Gaulle airport). Most of the hotels are around, in this part of Paris which is called "Quarter Latin". Some of the (cheap) hotels are around the metro stations "Place d'Italie" or "Tolbiac". From there, you can take line 5 to "Place Monge", and then walk to the conference building (should be 5 minutes metro + 5 minute walk). If you need advices, don't hesitate to send us a mail.