WormBase is the repository of mapping, sequencing and phenotypic information for C. elegans (and some other nematodes). The worm informatics group at the Sanger Institute play a key role in assembling the whole database (a new release occurs every three weeks). Registration not required.
The National Human Genome Research Institute (NHGRI) model organism ENCyclopedia Of DNA Elements (modENCODE) Project will try to identify all of the sequence-based functional elements and the genome-wide patterns of regulatory interactions in the Caenorhabditis elegans and Drosophila melanogaster genome. Registration not required.