I think on average; only one or so undrafted FAs per year make their respective teams 53 man roster. I remember a few years ago the Giants had 3 undrafted FAs make the roster and that was called an anomaly by the Giant newsletter I read. Still, I have a good feeling about where our white skill players picked to play.
Danny Amendola in Dallas (their isn't a lot of talent behind Owens, Crayton and Glenn and Glenn is getting older and he's injury prone; they also drafted zero WRs), Samuel Giguere in Indianapolis (probably a P-squad player this year, but he picked a white friendly team who only drafted one WR (small schooler Pierre Garcon in the 6th round) who is likely to beat out Onrea Jones for the last roster spot), Luke Swan in KC (KC has a total of one good WR (Dwayne Bowe) and only drafted one guy who is sure to make the team (Will Franklin) in the 4th round), Todd Blythe in NO (If two of the following fail to make the team: Terrence Cooper, Devery Henderson, David Patten or 7th round rookie Adrian Arrington he'll make the roster; I suspect he'll get the P-Squad if not).
I also think Danny Woodhead was smart about picking the Jets. However, he will probably have to take a year on the practice squad to learn the NFL return game and improve his ability as a receiving RB even more (he'll have to get real good at those areas as an undersized white RB). I don't know if Justin Beaver has a shot, but you never know. The number two RB behind Ryan Grant is Brandon Jackson and he sucked as a rookie, the number 3 is Vernand Morency who has done little in his career so far since being a 3rd round pick in 2005. And the Pack are unlikely to carry 3 FBs again.