Yep... I haven't taken measurements, but I have also read is hope on the horizon for restoration.
Some explanation of the shortness may be found here (http://www.doctor4men.com/faq.asp), I copied part of the text below:
DECREASE IN PENILE LENGTH
Q After recovering from my radical prostatectomy, I noted an obvious decrease in penile length. In selecting surgery over radiation, I had considered the possible side effects of impotence and incontinence, but not this other outcome. The surgeon says that he "pulled down" on the bladder neck to reconnect it with the urethra after excising the prostate, but it seems to me that the reconnection technique would also likely have a "pulling up" effect on the he urethra with an attendant effect on the external penis. How common is the situation I have described?
A - Shortening of the penis is more common than many surgeons admit to after radical prostatectomy (RP). I have had many patients tell me that their penis is shorter after RP. The reasons are not fully understood but I can think of two possibilities. First, the lower part of the incision for RP is close to the base of the penis and natural scar tissue with healing may "trap" more of the penis below the skin. Second, the re-hook-up of the urethra tube to the bladder may shorten the urethra and not allow the erect penis to be as long. Other possibilities are that the nerve supply to the penis is affected and general "tone"" of the penis is more flacid because it is not storing as much blood as before the operation. Despite this side effect, the benefit of RP as a curative treatment for early stage prostate cancer is becoming clear. The Johns Hopkins Hospital recently reported (JAMA, 281; 1591, 1999) results of almost 2000 men who had RP between 1982 and 1997. There was an 82% chance of 15-year survival free of metastases (spread).
Furthermore, as men are getting screened more, we are picking up early stage cancer that is easier to treat and the odds of side effects such as impotence; incontinence and penile shortening are less.
Hope this helps!