This creates a drop-down list of all sites in a multi-site install and lets you switch to the corresponding admin page of the other site.
Plugin Tag: multi-site
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Add Clone Sites for WPMU (batch)
Batch add new sites on WordPress MU / WordPress Network while using a template site to clone, includes batch domainmapping of the new sites.
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WooSite
WooSite is used to connect to the WooMulti plugin, as such it requires the WooMulti plugin on your main site.
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Multi-Site User Replicator 3000
WP3.1 multisite "mu-plugin" that allows you to add a user to all sites or no sites. Just drop in mu-plugins.
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Multisite Themes
Adds the ability to have different themes available to different NETWORKS in a multisite atmoshpere.
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GrabWP Tenancy
Multi-tenant WordPress with shared MySQL, domain and path routing, and isolated uploads.
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Ada WPMS Sitewide Feed
Creates four rss 2.0 feeds showing recent posts, comments, pages, and one combined [posts and pages] from all blogs. Works both on WPMS, and WPMU
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MassPost – Post, Share, Send to Several Websites
Publish once, distribute everywhere. MassPost securely pushes WordPress posts, all formats, images, categories etc to multiple sites.
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Multi Site Plugins Add New
Adds an "Add New" sub menu item to the Plugins menu of all sites inside of a network for network admins.
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Alex Set Favicon
Alex Set Favicon allows any user to easily set and update their favicon. See http://anthony.strangebutfunny.net/my-plugins/alex-set-favicon/ for help