Pre-Lion 2011 it was in all the Mac related news sites, forums, etc.
Apple even allows running Snow Leopard under (Mountain Lion, but not sure about under Lion) so you CAN use Rosetta.
To me, Rosetta was almost a mini-VM of its own, 2GB of shared memory for PowerPC code emulation and imperfect.
But every Mac Pro can still run Snow Leopard and dual booting is easy. Not everyone wants or needs Lion or ML or Mavericks.
So there are workarounds.
I was amazed and shocked when I heard how many service bureaus run OS 9 because their workflow, scripts, printers worked fine and didn't need OS X (which really wasn't ready for many anyway and RAID performance seemed crippled 'cause it was slower than OS 9, both of which pale in comparison now to talk of 500-900-1200MB/sec for today's storage on SSDs).
Tip: never install a new OS without having a backup copy of your working system; better yet , do a clean install on a new or different hard drive device. Especially as a way to break with past older code, drivers, apps and tasks that can affect adversely when installing and running Lion and above.
Get out your SL DVD and install it on a disk drive if you don't have a working copy. It is still supported, gets security updates. Use ML if you must use some new feature (too bad can't run ML in a VM under SL I guess).