Soon the forth congress will take place in Leipzig form 15th-18th march 2010. Its the greatest congress in German librarianship and is organised by several library organisations.
Informations about subscription you find at http://www.bid-kongress2010.de/pdf/anmeldung.pdf.
You can register only online, see https://www2.kit.de/bib10/registration/bib10/de
The programme is available under http://www.conwerk.net/contxt_bidkon10/programme. Printed programmes are only given to registrated participants.
If you want to come to Leipzig and participate, there are possibilities for getting a grant by BI international,