AirVideo is my preferred App for Video streaming. To stream videos a server running AirVideo-server is needed (java application for mac, linux and windows). Every possible video format is supported and transcoded in realtime. So no matter which size the video has, AirVideo downscales it and sends it to your iPhone/iPad over WiFi or 3g.
iSub is an advanced Audio streaming software. iSub lets you connect to a subsonic server. So if you have subsonic already running on your server check this App out – otherwise get a server :p. Subsonic streams audio files and transcodes them with lame automatically (if they are above 192kbit/s as an example). audio files are stored on internal iPhone storage until a certain threshold is reached – automatically the audio file played
Reeder is an easy to use RSS reader with beautiful design. You can synchronize with Google RSS if you want to.
PhotoSync helps you to synchronise your photos and videos between different iOS devices without the need of a cloud service. I use it to transfer videos from iPhone to iPad – especially when i am on vacation.