For those of you who are reluctant to visit wikipedia, a pomosexual is a person who does not believe in using labels to define orientation.
This is dripping with irony; they are labeling themselves as "people who dislike labels." I would think if they actually disliked labels, they would just say so instead of, you know, labeling themselves.
I am not sure how I feel about the actual concept. On one hand, labels are helpful to find people compatible with us (whether for sexual or romantic relationships, or even for friendships). On the other hand, labels often become limiting, especially to people whose orientations are not clear-cut.
I guess that I support the use of labels, but only when they work. For instance, I have realized that I am an asexual. However, I am not at all certain as to my "romantic orientation." I plan to go on a case-by-case basis for romantic relationships, so I don't need a label for my preferences in that area.
Labels are useful in describing ourselves, but sometimes they can't sum up our true feelings. *shrug* If they work for you, use them; if they don't, pomosexuality it is.