According to Hardocp.com (linked above), the British Royal Navy sailors in the UK are being issued with PSPs in order to help them with their training.
Apparently, the PSP units come preloaded with slides and commentary which are about 8-12 minutes per training session.
To quote: "While the US builds PS3-based grids for cracking passwords, the UK is buying Sony PlayStation Portable (PSP) units and issuing them to Royal Navy sailors for use in training. The units come preloaded with study packages of slides and commentary and are about 8-12 minutes per session.
The first to receive the devices are marine warfare engineering technicians, who maintain the fleet's radar, sonar, VHF radio and communications systems.
If the PSPs are a success, their distribution could be widened throughout the Navy, starting with air and marine engineers but potentially to many other disciplines."
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