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Haderlumpon Vim: Buffers, Windows, and Tabs

Also the plugin "Buffer Explorer" http://www.vim.org/scripts/script.php?script_id=42 which lets you switch between all buffers easily. Without it vim is not complete.

Haderlumpon Vim Slime: A vim plugin to give you some slime. (Emacs)

I use Slimv with Clojure, and love it! You get most of the slime commands, like macroexpand and a REPL in a vim buffer, with doc lookup etc. It even comes packaged with paredit for Vim.

After the most recent bug fixes it has gotten a lot faster, so make sure you get the latest version from https://bitbucket.org/kovisoft/slimv/ - version 0.9.5 on vim.org still has a bug that causes it too slow down.