Watching Movies:
1. Download your movies from IRC.
2. Convert your avi/divx files to MP4: Leawo MP4 converter (fast and easy)
3. Drag your MP4 files to Itunes > Device > Movie folder.
4. Click "Ipod" icon and enjoy your movies.
Reading Books:
1. Download books from IRC in epub format.
2. Install iBooks (free) from Itune App store.
3. Install Dropbox (free) on the computer and your Iphone. Dropbox allows transfering files between the Iphone and the local computer.
4. Download one epub file using Dropbox. Dropbox allows Ibooks to open the downloaded epub file.
5. Ibooks will create a folder Books in your Itune > Device > Book folder, you can then use Itune and send your epub files there. It is faster than using Dropbox.
Reading Comics:
1. Download your comics/manga from the web (google/forum).
2. Install a cracked version of Comic Zeal using Installous (Cydia from source http://cydia.hakulous.us). A bit tricky here!
3. Upload your comics/manga using Itunes > Device > Apps > Comic Zeal Apps.