How to exchange files between 2 computers connected via WLAN to the same router?

[floppy]

Hello,
I would like to exchange files between my 2 PCs. But nomore via USB storage or via mail sending/reading.
I tried to use an USB storage connected to the router but this is an USB1.1: so, forget it, the speed is too low.

The PCs are,
PC1: desktop with TCL3.3 and WLAN USB adapter (via USB1.1 today, hopefully 2.2 the next days).
PC2: ASUS laptop with Ubuntu 10.04 (from my wife) and WLAN
Router: Fritzbox 7170.

The Idea would be:
- I define a directory on my desktop ..hdb3/exchange/
- I define a directory on the laptop /dev/sda3/home/exchange/
- I connect whatever PC/Laptop on the other directory to write/load the files available on it.
How should I do the setup on both PCs? How to put/load files on the directories? are specific extensions to be started?

Thanks a lot for few answers in order to get the job done.

Pascal

[tinypoodle]

Despite being about exchanging files without a router, this thread could give you several hints:
http://forum.tinycorelinux.net/index.php?topic=8004.0

[ACRizona]

the 10cent list:

On Ubuntu: set-up and start the FTP file-transfer service included w/Ubuntu.
      'Publish' access to /home/wife/stuff with logon yourname.

On TinyCore: download the app curlftpfs.
      Set up to "map" //ubuntu/home/wife/stuff to your /home/tc/wife.

All her files show up as just-another-folder in your file manager.

( works great on Windows and Apples, too )