Tried it once, hated it. Although that could have been because the girl was crazy and borderline retarded (OK, I exaggerate a little, but I get bored of girls who aren't razor-sharp very quickly). Still, any online relationship is going to be long-distance by definition, and it's unlikely that the partners will meet for some time. Maybe some people can enjoy a romantic relationship without a physical aspect, but for me that's impossible.
Sorry to disappoint you all.