I upgraded from Parallels Desktop for Mac 5 to 6 in the hopes of being able to virtualize Lion (I'm a developer and I still support PPC Macs so I can't fully switch to Lion yet). Hopefully Lion support is coming soon. Anyway, they still haven't fixed one really annoying problem that I reported over 2 years ago. Pressing the tilde key (~) still results in the plus-minus symbol (±) being entered instead. It's kind of a problem if you work from a shell often like me.
