I'm sure many of us run forums, blogs, and have contact pages that get spammed with nonsense or links.

What have you done in an attempt to curb this? I've noticed a simple trick with forums:

Unless the site is based on it, don't put your forums in the main directory nor should you put them in the pre-named / default directory (like /smf/ or /phpbb/ etc.) or leave them in an obvious directory (/forums/ or /board/). Most spam-bots will go right to them. Instead, create a directory for it like /communication/ or /right_here/.

I did this with one and it turned off the spam instantly. It went from dozens of spam-registrations a day to zero.

Blogs - if you're serious about it, set it up so all comments must be approved by an admin. You may still get some but they won't post.

Don't post links to your email, edit to something not recognizable by most spam bots (like name (at) domain (dot) com) or better yet, use a graphic.