In a previous hint, I suggested to install the development version of the GIMP (which also has the new, well-known single window mode) in an Ubuntu virtual machine: which obviously wasn't an optimal solution.
Now, there is another option: install the GIMP 2.7.3 via MacPorts; here's how to do it.
First of all, if you don't have it yet, you need to install MacPorts, available from here.
It is always a good thing to do a selfupdate; in the Terminal type:
$ sudo port selfupdate
Now, we can install the GIMP's development version (currently available in version 2.7.3):
$ sudo port install gimp2-devel
There are also many, many dependencies, and thus many packages to compile form source, so you must be patient; it can take several hours (for me, on a 2010 Core 2 Duo Mac mini Server with 8 GB of RAM, it took approximately 5 hours).
Once installed (gimp2-devel will be the very last package to be compiled and installed), you can run it, again from the Terminal:
$ gimp
It is an X11 program, so this command will first launch X11 or XQuartz (in your Utilities folder), and then the GIMP.
One problem is that there are only two default themes, so, if you want a better look and feel, just take the additional themes from the current OS X version of GIMP, available from here (the Snow Leopard version works fine in Lion).
To get the additional themes ('Glossy P', 'Leopard', 'ProApp' - rather cool! - and 'Tiger') also in GIMP 2.7.3, just copy them from
/Applications/Gimp.app/Contents/Resources/share/gimp/2.0/themes
into
/opt/local/share/gimp/2.0/themes.
Obviously, also this one is not an optimal solution, as it takes several hours to compile everything from source, but it can always be interesting as an experiment.
The best thing would of course be if eventually there were a precompiled version available, from the 'Gimp on OS X' site or elsewhere: so, let's hope that this will be the case, at least for the final GIMP 2.8 release.
[crarko adds: On the off chance that someone reading this doesn't already know, The GIMP is an image manipulation program, along the lines of Photoshop. One of the big winners of open source.
P.S. The site was hit with a ton of spam, and while I'm cleaning that up this will be the only hint published today. Hopefully things will be better tomorrow.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20111117032604297