In WordPress you are very limited with your input types. You have the title, the content and then you can hack something together with the custom-fields. But this is a bit geeky and no normal user really understands how to use custom-fields.
Now this is where the UIElement Class kicks in! It works with the custom-fields, but it masks them as if they were super cool UI-Elements build in by WordPress. Combined with the new Custom-Post-Types it gives you a powerful tool and possibilities you never thaught of! In just a few minutes you can build you own event-calendar, adding a custom-post-type named event and then just add some cool extra-fields like a datepicker for the date, maybe a TinyMCE-Editor for a nice little well-formed description? This is all possible with the UIElement-Class, is that cool? I’m sure it is!