Gotchas?

Hey guys, i'm downloading the new version of ubuntu for x64 processors....I'm just wondering if there are any major "gotchas" for installation? I was also wondering if i can use 32 bit packages with this version of ubuntu when i get it up and working?

I've used linux a few years ago, and would like to try it out again. Hopefully this time I can get it working with all my hardware.

I was also wondering if I need any raid drivers to get ubuntu to install?

Thanks again.

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Wasnt sure how to reply to leave a new note, so i'm putting it here.

It was really easy to install ubuntu, seems like everything's working so far.

I'm just curious, are there still no official dvd decoders available for linux?