Lucius - nice color scheme
http://www.vim.org/scripts/script.php?script_id=2536

PreciseJump - visualize f/t/b/e jumps
http://www.vim.org/scripts/script.php?script_id=3437

CCTree - access to the cscope database as a tree
http://www.vim.org/scripts/script.php?script_id=2368