i like personalized reg plates i think it shows individuality if your plate actually means something or even if you get it for a joke.
im sure you've all heard the saying 'if a guy buys a fast car hes probably got a small knob' well someone near me has 'W33 NOB' just for a laugh..
and a guy i've seen about with a white Audi R8 has 'R8 GTF' (as in get to ****)
so i think they're quite cool, they can also hide the cars age if you don't want people to know you have an old car (daft i know but one of my friends has done it

)
i don't agree with cars that have illegal spacing on there reg though.