The GSC 6 workshop will take place at the EBI Oct 15-17, 2008. There will be a GCDML satellite meeting the 13 and 14 of that week. Further details and an agenda have been posted into the GSC wiki.
This meeting will be followed by GSC 7, which will be combined with the much larger Metagenomics 2008 meeting to be held in San Diego, the week of November 3rd.
GSC 7 at MG08: http://metagenomics.calit2.net/index.php