Kip from zenpax.com has released a beta version of a WordPress plugin that improves upon Skippy’s original plugin. Here’s the word from his site:

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Gravatars2 is a WordPress plugin, modified from Skippy’s Gravatars with the following enhancements:

• Caches “No Images” and Errors (in addtion to images, of course)

• Separate cache times for all 3 cache types
• Greatly speeds up page loads which are slowed down by having to check the gravatar.com server (and removes a LOT of load from the gravatar.com server)

• Unix-type “system cron” job can be used to have all cache refreshes performed by the server, without user interference
• Skippy’s “WP-Cron” can be used if a true system cron is not available (Gravatars2-WPCron updated for clean integration)

Various other things which may or may not be noticeable to you, but are good

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Get your WordPress 2.0 tested Gravatar plugins now, at http://zenpax.com/gravatars2/