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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Multipage
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Kirki – Freeform Page Builder, Website Builder & Customizer
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FluentCart A New Era of eCommerce – Faster, Lighter, and Simpler
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Newsletter – Send awesome emails from WordPress
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Multisite Site Index
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WP Change Custom Posts Slugs
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Tag, Category, and Taxonomy Manager – Autotagger Automatically Add Terms
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FancyTube – Video Gallery, Video Slider, and Playlist Slider for YouTube
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Postname Permalink Auto Redirect
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Kama WP Smiles
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WP-Paginate
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CoSchedule
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wp-Typography
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Related Posts for WordPress
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Affiliate Power – Sales Tracking for Affiliate Marketers
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WC Duplicate Order
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Widgets for Social Photo Feed
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Product Options and Price Calculation Formulas for WooCommerce – Uni CPO
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Loading Page with Loading Screen
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APCu Manager