[EverythingEverywhere]

Links to your site cannot hurt you, regardless of the source. If they did, then you could create a PR0 site and nuke competitors.

A PR0 site which links to you might not do much for you, but it wont hurt you.

What can hurt you are the links you have going out. Keep them topical to your site, don't try to have too many, if possible use 'nofollow' (I use that for most of my directory links. They only seem to check if the image is being downloaded). If you link to a bunch of other sites, consider putting them all on one page, not having them on every page.