Should I use a "-", ":", or "|" in the title tag?

[beeneeb]

Out of habit, I've always put a "-" or dash to separate items in the title tag. However, I've noticed that more and more sites are using either a ":" or "|" in the title.  Is there one that is better to use than the other?

[TellThemEverything]

No difference - but it is true that some prefer | nowadays - more from a conversion point of view than for SEO. Google views them all the same.

[CPU]

Pipes are increasingly popular but a great deal of 'expert' SEO's still use hyphens. I tend to use pipes on new sites and haven't changed the hyphens on old sites.