Have you checked out the Online Bioinformatics Resource Collection (OBRC) brought to you by the University of Pittsburgh's Health Sciences Library System?
The OBRC is a manually curated collection of biolnformatics databases and software tools. Search for topic or tool of interest among the annotations and links for 2440 bioinformatics databases and software tools. Need to find out what tools can be used for phosphorylation? Enter the term and see what you get!
TAIR -- The Arabidopsis Information Resources maintains a database of genetic and molecular biology data for Arabidopsis thaliana.
NCBI (National Center for Biotechnology Information) -- collection public databases for research in computational biology, genome data, and biomedical information.
Ensembl -- software system which produces and maintains automatic annotation on selected eukaryotic genomes.
GenePattern -- analysis workflow tool developed to support multidisciplinary genomic research program.
BLAST -- analysis tool that finds regions of similarity between biological sequences.
LigerCat is a PubMed search tool that uses tag clouds to show important concepts and trends. LigerCat aggregates multiple articles in PubMed, summing their MeSH descriptors and presenting them in a cloud, weighted by frequency.
MeSH is PubMed's controlled vocabulary.