I generally don't get under the covers a lot on programming these days, but I'm doing a little exploring to figure out why all parts of a particular portal page render find for me...except the one I need...on the iPad, and found a really good overhead summary of the underying OS and interfaces/languages involved over at the Enterprise Software DEvelopment with Java blog.
This in turn pointed to a handy page on our web on Developing for the Apple iPhone with Oracle JDeveloper and ADF. The article is a bit old, but still a lot of good stuff in there.
And yes, this is my first blog entry done from the iPad. I wouldn't try it from Safari, but using iCab browser, the best browser available for the iPad, it was only like pulling teeth to do it, not like pulling teeth with greased chopsticks, as it would have been in Safari for iPad.