Take a look at the website thundersplace.org. There are many, many guys who have gained significant amount of both length and girth. It's a free site, and they are not selling anything...just guys trading information about what works for them and what doesn't. (They currently have well over 100, 000 members, some more active than others.) It's probably the best all-around site on the web for in-depth information with no fees or hidden agendas. They have free videos, mentoring, and no lack of advice from other successful gainers.
The key seems to be staying on a routine, and it takes a lot more than 3 months of every other day exercises. Most successful gainers exercise 5 or 6 days, then rest for one day. A daily session may last 30 to 60 minutes, depending on the routine you've set for yourself. Routines can consist of combinations of jelqing, stretching, hanging, and pumping.
Once you get to your goal, a maintenance course of some sort (maybe once a week) is recommended, just for good penile health, but it's rare for anyone to lose any significant gains.
Surgery is generally not recommended on that site, as complications can result in some cases, and some of the photos I have seen are not very pretty. There have been a few guys who had lengthening surgery, and then found that website later, to their dismay. They could have saved a lot of pain and suffering, not to mention the cash outlay for the surgery. Surgery usually consist of severing or weakening the suspensory ligament allowing the penis to hang a bit lower, giving the illusion of length gains. To gain girth, some guys elected to have sub-dermal grafts or various injections (those are the one who can end up disfigured the most).
Me? I gained abut 1.5 inches (currently at 7.25 inches), but I am not nearly as locked into a routine or as consistent as others have been. It took me about a year to achieve those gains, and my goal is 8 inches.
-Groanman