We having a distro shootout or what?. Anyways, the most imp like Dr. Shahrukh also mentioned is to be aware of the boot loader config.
Keep one main gnu-linux partition as bootable, do not re-write the mbr for any other distro you install. Copy the kernels from all your new installs to the main gnu-linux boot partitions and just keep appending the entries into the /boot/grub.conf file.
This way you can manange any amount of operating Systems on one machine. The tricky situation one can get in is with the *BSDs. With careful configuration you can get through on this one too. You could again choose the Gnu-Linux grub boot loader to boot into the system
For Sun Solaris 10 x86 i would suggest you get an additional HDD and save you some paracetamols. MS has enough of documentation and hence you should find configuring that a breeze.
Who ever said FSF/OS fanatics aren't open minded. Boooooooooooooooooooooting your way around..:D.
Trevor
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