where did u get this?
d80 came out 2.5 years then d90 came out.
even if a new model come out...its probably gonna be like d90s or smth...with more megapix fill in...
comparing d90 and 550d is irrelevant.
550d has only 1 dials no does not have top lcd panel. this category of camera belongs to the entry level and should be compared to d5000 instead.
d90 is more comparable with 50D. with 2 dials and top lcd. if you are shooting events, or more serious stuff...2 dials and top lcd is a need (not a want). if its just for leisure... just grab the 550d...or even pentax k-x
It just depends on how well you understand your camera body. can always compensate the 2nd dial. Seen events taken with single dial cameras.