The Arabidopsis Information Resource (TAIR)
http://www.arabidopsis.org/ 

The Salk Institute Genomic Analysis Laboratory (SIGNAL) for the identification of insertion mutants and cloned genes of interest 
http://signal.salk.edu/ (T-DNA Express) 

The BAR Arabidopsis eFP browser (University of Toronto) for exploring gene expression pattern 
http://bar.utoronto.ca/efp/cgi-bin/efpWeb.cgi 

Gene expression network in seed development (Goldberg and Harada) 
http://seedgenenetwork.net/