Test-drive the new vim 7.4 prerelease

readme

The biggest additions since 7.3: 
- A new, faster regular expression engine. 
- More than a thousand fixes and small improvements. 

Once you have installed Vim 7.4a BETA you can find details about the 
changes since Vim 7.3 with: 
        :help version-7.4 

install.sh

cd /tmp
wget ftp://ftp.vim.org/pub/vim/unstable/unix/vim-7.4a.tar.bz2 -O- | tar -xj
cd vim74a

sudo mkdir -p /opt/vim
sudo chown $USER /opt/vim

PATH=/usr/bin:/usr/sbin:/bin:/sbin ./configure --prefix=/opt/vim --enable-rubyinterp | grep ruby
make && make install

ln -sf /opt/vim/bin/vim /usr/local/bin/vim

If you're using MacVim, you can download the beta here.