Other than camber profiles (meh, I prefer Camber), and "serrated edges" like Magne-traction (meh, I prefer regular edges)... Not that much has changed.
They're still wood, FG, and ptex boards with metal edges. Sure resin technology is always improving, sidecut shapes, fibreglass layouts (bi-axial, tri-axial, or quadraxial), carbon fibre and/or kevlar layers, titanal layers, etc. are improving.
I just think for the average middle of the road board, things aren't that different.
Sure a lot of little things can add up to a lot, but I wouldn't get rid of a 2005 board just because there's something newer out there. If it still rides well why not keep it? Unless of course the OP has got 100+ days on it in which case it's probably getting softer.
Speaking of softer, did I hear the OP say he wanted a softer board?