Is there a preferred way of getting this going? I tried the GHC
To get GHC 6.6 on Ubuntu I recommend you my way, getting the sources for the packages for Ubuntu + 1 and building the packages. It is very easy, I've documented it on my blog: http://pupeno.com/blog-en/unstable-packages-on-ubuntu/
instructions for Debian, but this seems to depend on 6.6 already being in the repository, which it's not, in Ubuntu (why?).
The lattest stable Ubuntu was released before GHC 6.6. Same for Debian. GHC 6.6 will be in the next release of both.
I like Debian/Ubuntu's install system, and I assume that 6.6 will eventually make it into Ubuntu. I want to be sure whatever I do now doesn't later confuse the system.
What I recommended shouldn't cause any problem or confusion.
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Pupeno