BlueFire is my favorite app for reding PDFs. I real like the navigation in landscape/portrait modes - simple tap and the application seems to know what you mean, that's brilliant

Honestly what else would I tap the screen for

I do not like swipe gestures in other applications, it's an effort and distract the reading experience.
If I may ask for features, I would like to have dictionary (customizable as I read in several foreign languages), and perhaps a quick look into Wikipedia definition as a popup would be nice when reading technical magazines.
I would like to have a true reflow. In fact I am looking for it on AppStore all the time but none of available apps seems to do a full reflow. They merely extracts text - what about vector graphics and embedded bitmaps? Look how PC software "adobe acrobat reader" does reflow, I dream of having such reflow on my iPad.