Nearby to the venue site (within 10 minutes walking distance) the Welcome Hotel Paderborn (http://www.welcome-hotel-paderborn.de) offers for participants of SAGT08 a special rate of 85 Euro per night including breakfast. Remark "SAGT08" when making a reservation at this hotel.
The city of Paderborn offers several hotels in all price categories.
Please, have a look at:
From all downtown hotels exist good connections with bus line no. 11 to the Heinz Nixdorf MuseumsForum (HNF), the SAGT08 conference location.