Key servers are servers on which public keys are stored for others to use.
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Canonical SKS PGP Key Server
Reliable public PGP key server run by Canonical Ltd who are known for the Linux distribution "Ubuntu"
Key server list by David Ross
Extensive list of PGP key servers that have been tested on functionality and synchronisation (SKS).
MIT PGP Key Server
Public key server hosted by MIT.
peegeepee key server
A public PGP key server with web interface and profile pages
Provides services for the SKS keyservers used by OpenPGP.
The WWW Based Key Server System
Get PGP keys through a web interface.