BioGPS is an upgrade to the GNF Symatlas that had data in the UCSC database on gene expression. The new database allows you to login and create your own views based on which information you would like to see. You can view pages from wikipedia, UCSC, ensembl, as well as GNF's gene expression data and gene viewer. Also, if you're inclined, you can create your own plugins for use within the site. Check it out, I think you'll find it worthwhile.