This isn't really a question. I think it'd be nice to share and collect and discuss different databases to explore gene expression. I found BioGPS (http://biogps.org/#goto=welcome) quite helpful, as it bundles very detailed expression data (tissues, cells and many more) with gene/protein data and is therefore very helpful to quickly get an idea about a gene/protein's function that turned up in a screen. It is quite human/mouse centric, so for Drosophila I'd always recommend flybase.org. Feel free to try it or suggest databases you find more useful.
Gene expression profiling
The first most interesting question for me is always: which genes are really significant (between two groups of chips). I use the BioRetis database for this purpose (http://www.bioretis-analysis.de/db/comparison). The drawback is, that you can only analyze data for free, if they are already included in the DB. If you want to analyze own data you have to pay a fee per chip. Without registering you can play with BioRetis using the tab public content.
InSilico DB let's you export thousands of datasets to different analysis tools in a ready-to-analyze format. Tools include Gene Pattern, Gene-E, IGV, Ingenuity iReport, R-Bioconductor, Genomespace and more. You can get from a dataset to a heatmap that shows over-expressed genes in one condition VS another in minutes. You can create new datasets by combining samples from various public datasets, and share them with your collaborators.
It's publlshed in Genome Biology and is accessible here: https://insilicodb.org
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