Is there any importance in including http:// in the url?

[MarloSchneider]

I have seen some sites that always redirect to https and some sites that always redirect to http://, but lately I have seen sites that force the url to just the site.

As in [sitename].com, no www. no http://.

Does this affect SEO in anyway? Is it good or bad for other things?

I was surprised when I saw it and don't really know what effect it has.

[ske11]

You need to point the site to one option or the other, there is no benefit one over the other, but people are used to saying www.

In addition to that SEOmoz use www, and for this sort of question I tend to use this site as a rule of thumb guide

I hope this helps

Sean