Olympus Microscopy Resource Center — interactive Java tutorials designed to simplify and explain complex topics in microscopy, optics, digital imaging, and photomicrography.

 

Open Microscopy Environment — a multi-site collaboration that produces open source code tools to support data management for biological light microscopy

 

International Society for Analytical Cytology (ISAC) — Home of the flow cytometry community. Check out their freely available lectures and presentations.

 

General Cytometry Email List — also known as the Purdue Cytometry Mailing list. While generally more focused on the hematopoetic lineages that are more appropriately analyzed in suspension with flow cytometry methods, this community has expertise in microscopy and image-analysis, and the generosity of its senior members in answering newcomers’ questions is remarkable. 

 

HCS -- High Content Screening and High Throughput Screening Discussion List — more focused on developing image-based assays of adherent cells than its sister flow cytometry mailing list, this community is just getting started.