All my favourites have been mentioned already, so I'll second:
Garmin eTrex series (I've owned three, currently using a Vista HCx)
Mavic A719 rims
B&M 'IQ' lighting (in spite of my electrical/bracket issues with the Ixon IQ. The Cyo Just Works.)
M520 pedals (buy some cleats, get a set of no-nonsense pedals for an extra fiver)
Koolstop dual-compound pedestrian-warning system
I've also been impressed by:
Those Excellent Infini Rear Lights (TM) (sadly now discontinued, but top value at 4 quid inc batteries for a decently bright rear light with huge reflector)
Ergon GC2 grips (excellent for flat bars)
SRAM Powerlink (need I say more?)