Hii Friends,
i m newbie to iphone development , i have to design a iphone webapp,have found these three have the best features,
Plz point out these pros and cons of these mobile frameworks?
Does php is needed for form processing or we can use xml,feeds etc?
You can find a little survey here. Also, I suggest you to look at this answer from the user Adrian Kosmaczewski here, and at his slides (see the link inside the his answer).
Then...
If you don't want to code it yourself: A good solution would be to use Wordpress with this or some other mobile plugin. You will easily get a robust blog/cms(sort of), feeds and a lot more.
If you want to code It yourself: Any server side technology could be good but I'm a strong fan of ruby and rails. I will add to It jquerymobile because it have John Resig (jquery creator and lead developer) behind :) and because supports a lot of mobile platforms.