When a website requires a Flash plugin, it provides a link to a "Get Flash" page. From here and on most devices, you can download the appropriate version of Flash and be up and running in a few minutes. In the past, iPhone users have been greeted with a message that basically states that Flash is not available for their device.
A recent change, pointed out by GearDiary, shows Adobe getting a bit more snippy with Apple. The updated page now states that:
While this may not be "breaking news," it does say a number of things. For one, Adobe is clearly able to develop Flash for the iPhone and obviously wants to introduce it on the iPhone and iPod touch. This also shows that Adobe is very in tune of all the complaints and has redirected the blame to Apple."Apple restricts use of technologies required by products like Flash Player. Until Apple eliminates these restrictions, Adobe cannot provide Flash Player for the iPhone or iPod Touch."