[thatmiddleway]

You should check out macVim. There's a build available with a real gui project tree, and it has regular GUI tabs that you want. I use it occasionally, but I like having everything in one place with tux panes:)

[bengl]

Here's the fork with the GUI project tree:

https://github.com/alloy/macvim

Screenshots:

https://github.com/alloy/macvim/wiki/Screenshots