There's also this very comprehensive site for calibrating and testing LCDs, http://www.lagom.nl/lcd-test/
meta: I'm somewhat surprised neither site has gained any traction as a submission over all these years; do we care so little about the quality/calibration of the primary interface to our PCs? It was actually only after discovering that second website that I realized my graphics card had been set to limited RGB (the default for Nvidia HDMI output!) the entire time, which outputs values between 16 and 235 (what most TVs can handle) and had obliterated the contrast ratio of my monitors.
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