Autobahn is a lightweight application that provides accelerated downloads and more reliable streaming video for popular applications and websites.

Autobahn will improve and optimize  your internet connection to improve your online experiance. Autobahn handles download requests from your web browser and applications and automatically improves downloads and streaming video.

Autobahn is currently accelerating all of your downloads through iTunes. With Autobahn for iTunes, you get the fastest downloads of music and videos through the iTunes store.

Autobahn does not use peer-to-peer transfers and does not use any upstream bandwidth.

Homepage - http://www.getautobahn.com
Download - http://updates.swarmcast.net/swarmcast/current/AutobahnAcceleratorInstall.exe
Size: 6.69 MB

Features:

- Direct Graphics by fast zoom and various effects (required DirectX 9.0c)
- Read ahead by a comfortable slideshow file
- 2-screen mode
- Susie corresponding plug-ins
- Zip (cbz) / 7z / rar (cbr) / cab / arj / decompression without lzh Browsable
- Pdf support
- Powerful Key customization
- Unicode support

Screenshot:



Homepage: http://miyano.s53.xrea.com/
Download: http://miyano.s53.xrea.com/arc/Hamana20060619.zip
License: Freeware
Size: 1826 KB

I have had no problems with Mozilla Thunderbird since I started using it (which was a couple of months ago).