My experiences of an 8Gb install;
Worked a treat using the combined threads detailing trimming the build, I used an external DVD and a USB Hard-Drive. I built an install, then trimmed it, then used Disk Copy from the Leopard DVD boot to replicate that to the SSD
, then Mini'd it...
I used the Xslimmer app and Monolingual with no problems. (But read the warnings on here - I used it from a MAC to my build on the external USB drive which may have helped
I have quite a few apps installed, including iWork09
I have used Symlinks extensively to put as much as I can get away with onto my SDHC card.
My Mail folders are also on the SDHC card - using Symlink
I have my iTunes and iPhoto on an external USB disk - and their other files on the SDHC card - with Symlink to them
I also have my iPhone backup on the SDHC - again using Symlink
I then moved my Dictionary folder and Documents folders from the Library to the SDHC
I used SymbolicLinker - as detailed by another poster on the forum to assist in the creation of the Symlink files
I use Caffeine, MenuMeters, SmartSleep (although unsure if it does much), Warp for Space (great tip)
I also use the tip to scale down some apps - particularly the system preferences to 80% - again a great tip from a poster
At the end, I still have over 1Gb free, with OSX using 5.75Gb
I could move some of the Apps to the SDHC as well - with iTunes and iWork being by far the largest with nearly 500Mb between them. I already moved the Host/library/application support/iwork directory to SDHC - freeing about 350Mb
The only problems I get are coming back from sleep, Mail can think it has lost it's directories, Quit and Restart and it's fine. Obviously the SDHC card does not come back as quick as the SSD
Happy to detail all the stages, as I did document it all, including the size of the OSX image as I was pruning it at each stage.
Now, something I would be very interested in would be finding out if I can remove unused extensions, such as Graphics card drivers I'll never use... this way, I could free about 200Mb easily.