Should I create a Bootcamp partition (even if i plan on using parallels)? I just got a mac and i need to use windows sometimes.  I plan on buying parallels.  Someone mentioned that even though i plan on using parallels (so i don't need to reboot to run windows) that I should still do a bootcamp partition and then call up that partition from parallels.

Does this make sense?  I don't understand the benefit of why I would do this versus just using parallels by itself (without bootcamp partition)
I don't thinks so. I've been using VMWare (same way of working as Parallels) for years now without a partition and I've never suffered any issues.  

When using virtualisation software without a partition, the software creates a dynamic partition which will grow depending on your needs. So basically, it's the same. Only the dynamic partition is a virtual one.

So, in my opinion, there is no need to waste a predefined partition on your Macintosh HD. Just let the software do it's job and go with the dynamic partition.