WP3.1 multisite "mu-plugin" that allows you to add a user to all sites or no sites. Just drop in mu-plugins.
More Plugins
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SimpleTwit
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Wava Payment Plugin
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Wetterwarner
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CMB2
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Collapsed Archives
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Gauntlet Security
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WP Report Error
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WP Testimonial Carousel
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Virtuemart to woocoommerce
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Big Boom Alert Bar
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Security Checker for Themes
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myGWD RSS ShortCode
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Post expire date Sidebar
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Link Juice Optimizer
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Alt Magic: AI Image Alt Text Generator for WP & Image Rename
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Kads SEO
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Content Bootstrap
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ZenfolioPress
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RSS Custom Fields
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Shortcodify