Want to download torrent direct into wifi-router's usb port-pendrive.

Although it may be possible to access the Pen drive from outside your system dependent on opening the correct ports etc, torrents would require a program running in the router to do what you require, apart from utilising a PC as a router, you need the torrent software on your laptop to control the torrent download

You will not be able to run torrent software on a regular commercially available router, you would need to use a device capable of running the software as a router ie. a PC of some kind, this would need to have a number of network ports and be set-up to route any torrent traffic to it's local software and save to an attached drive - it may be possible to build such a routing device, but cost of build would be impractical for your use and would probably cost as much to run as leaving your laptop running as you now do

Maybe PI would be the easiest solution... It would still be a running system though, but wouldn't have to be your main. Quick start guide | Raspberry Pi

This would be a low cost solution...

you would need a monitor, but you might be able to run without it through connecting remotely from your main comp.

You could probably also set up an autohotkey script to launch programs etc.

Just an idea....

Also here it is on newegg: http://www.newegg.com/Product/Produc...9SIA1ZY0K49948

The Raspberry Pi is a single-board computer developed in the UK by the Raspberry Pi Foundation. The Raspberry Pi is a credit-card sized computer that plugs into your TV and a keyboard. It's a capable little PC which can be used for many of the things that your desktop PC does, like spreadsheets, word-processing, and games, as well as plays high-definition video. The design is based around a Broadcom BCM2835 SoC, which includes an ARM1176JZF-S 700 MHz processor, VideoCore IV GPU, and 512 Megabytes of RAM. This revision 2.0 board features two mounting holes for easy installation, a built-in reset circuit, and can be powered via the USB data ports. The design does not include a built-in hard disk or solid-state drive, instead relying on an SD card (not included) for booting and long-term storage. The Raspberry Pi is intended to run Linux kernel based operating systems.

have bitorrent shutdown the pc when the downloads finish.

click
options/auto shutdown/shutdown when downloads complete.

not the same as you were looking for but it will mean your laptop is not running constantly.