The other night I was watching TV with my dad and saw a Home Depot ad for two sets of LED flashlights. I have no idea how bright these are (either set), but if they're any good they can at least be used as "to be seen" lights. A little work with some red plastic and you've got taillights to go with the headlights too, since the one set is 5 of the things.
Another interesting option for visibility was recently featured on Urban Velo - reflective lanyards. The post is about a company (Scott's Knots) that makes to-order lanyards, some of which are made from reflective cording. The site actually has a section specifically for bicycle use, which actually qualifies them for inclusion in the bike-spotting series, where they feature seat danglers and side markers (for handlebars). Reflectors are a secondary "look at me" (see Sheldon on the subject) and I put these in the same category as reflective tape - a great, passive way to draw extra attention to your ride at night while also adding some style.