Hi guys, Long Nguyen Hai, a web developer in Vietnam, posted a workaround!
http://www.webvampires.net/post/3579438175/os-x-lion-workaround-for-istat-menus
I've copied the important parts below, in case the URL doesn't show up because I'm new to this forum.
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What I did is downloading the latest version of MenuCracker from SourceForge, overwrite the old MenuCracker.menu within iStat Menus.app. Optionally, kill the iStatLocal daemon process and overwrite the MenuCracker.menu file at /Library/Application Support/iStat Local/extra/
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And the link to MenuCracker is:
http://sourceforge.net/projects/menucracker/files/menucracker/menucracker-2.0b1/MenuCracker-2.0b1.dmg/download
UPDATE:
An easier way is to copy the attached com.apple.systemuiserver.plist to /Users//Library/Preferences and reboot the computer..
com.apple.systemuiserver.plist.zip