Great topic. I'll throw my guys out in a second, but I'll play wet blanket first...
Sims (RB45) - I forget where I saw it, but he was crap as a runner last year while decent as a receiver. Probably best suited for 3rd down duties while Martin (RB34) plods through his last year in TB or Rainey, who actually did the best of the three, takes over on 1st/2nd down. Rainey is truly the forgotten man here. Sims is still going too high for me.
Gore (RB16) - there have only been three RBs at age 32 to gain 1000 yards and two of them were special cases (Mike Anderson - was 32 in only his 5th NFL season and Ricky Williams - essentially missed 3 seasons). Maybe Gore can be the next Emmitt Smith, but even Emmitt's age 32 season was only 3.9 ypc so he did it largely on volume. At RB16, he's a high end RB2 which seems overpriced rather than forgotten.
Bell (RB18) - like others have said, Riddick will fill in the void left by Reggie. No real change here to get excited about.
Latimer (WR50) - possibly a good player, but just not enough passes to go around. Could be huge given an injury, though.
My list of forgotten players:
QB21 - Palmer - he's a great fit with Arians and people forget how well he was doing before injury.
WR31 - Floyd - he's a great post-hype steal. After being a popular breakout candidate last year, people feel burnt. The return of Palmer will be good for him.
WR39 - Fitzgerald - won't put up flashy numbers but he's still a good bet in the red zone.
WR42 - Decker - bad situation + injuries have led to bargain prices for a guy who was actually solid while semi-healthy last year. Chan Gailey + Fitzpatrick will be great for him.
WR70 - Britt - even as the WR2 to Quick, he should be better than 70. If Quick's injury actually keep him out, this is a steal.
WR71 - Stevie - only 28, he's almost totally forgotten despite three consecutive 1000 yard seasons in Buffalo not long ago. Actually looked really good last year, albeit in a limited role. Now he's playing with the best QB of his career and still in his prime.
WR73 - Randle - had a strong 2nd half of the season. Cruz no guarantee to be healthy.
WR?? - Miles Austin - a totally forgotten man. Turns 31 which is when WRs start to lose a little bit, but not enough to matter if he is able to grab the WR2 job in Philly. Chip knows how to cure the injury bug.
RB26 - Spiller - so much hype and then 2 years of Dud Marrone have made him a great post-hype pick, doubly so after being signed by Sean Payton who WILL use him more like Gailey and less like Marrone.
RB29 - Blount - currently sitting atop the Patriots depth chart.
RB44 - Riddick - he's inheriting the Reggie Bush role at a minimum and only 3.9 ypc Joique Bell stands in his way of carries between the 20s.
RB?? - Rainey - quietly the best runner on the team last year.
TE17 - Davis - SF will likely be a dumpster fire, but it would be criminal to ignore Davis again this year. So talented.
TE22 - Eifert - healthy and without Gresham, the former 21st overall pick is being totally overlooked in just his 3rd year
TE26 - V.Green - everyone is scared off by the Owen Daniels signing, but OD isn't really the picture of health. The well rounded Green will get his chance sometime this year.
TE28 - Heath - despite 66 rec and 761 yards, he's probably going undrafted due to only 3 TDs and another year of age. The dependable Miller shouldn't be forgotten already.
TE?? - L.Green - Gates' TD aberration made everyone forget about the most gifted receiver on the team. Will the staff finally be forced to utilize him?