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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Trace My IP – Visitor IP Tracker, Stats Analytics & Page Views Counter with Email Alerts
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WPFront Notification Bar
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jQuery Updater
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Video Popup – Video Lightbox for YouTube, Vimeo & MP4
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WP Event Calendar
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AJAX Heartbeat Tool
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Geo Data Store
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Robots.txt Editor
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Čeština pro WordPress
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Conflict Finder
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Plugins Condition
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Single Author G+ META
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Table rate shipping for WooCommerce
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DC Simple Share Buttons
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XML Sitemaps
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Support Ticket System
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Product FAQ for WooCommerce
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Easy Accept Payments via PayPal
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Sendy Widget
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No Category Base (WPML)