It's a good idea to have a directory on your website?

[Valarlf]

Currently I have a directory on a sub domain but Google apparently sees it as part of my main domain so all outgoing links may be affecting my rankings?

[SEO5Team]

i would say that it's ok to have outbound links on your site as long as the links are to established trusted sites.

More on the topic on this link including a quote from Matt Cutts on this question . http://lincontex.com/the-missing-link/googles-matt-cutts-vindicates-controversial-theory-behind-lincontex-com/