http://www.touchatag.com/ 

Contents: [Dobrica Pavlinušić's random unstructured stuff]
• Dobrica Pavlinušić's random unstructured stuff (install pcscd) 
• Dobrica Pavlinušić's random unstructured stuff (build libnfc) 
• Dobrica Pavlinušić's random unstructured stuff (dependencies) 
• Dobrica Pavlinušić's random unstructured stuff (checkout source and compile) 
• Dobrica Pavlinušić's random unstructured stuff (install dpkg packages) 
• Dobrica Pavlinušić's random unstructured stuff (modify pcscd configuration to recognize all readers) 
• Dobrica Pavlinušić's random unstructured stuff (restart pcscd) 
• Dobrica Pavlinušić's random unstructured stuff (test it) 
• Dobrica Pavlinušić's random unstructured stuff (read Mifare) 

install pcscd
sudo apt-get install pcscd
sudo dpkg -i libnfc-read_dev-build-1_i386.deb
sudo ldconfig

build libnfc
dependencies
dpavlin@t61p:/rest/cvs$ sudo apt-get install libpcsclite-dev build-essential autoconf libtool debhelper \
 subversion pkg-config libusb-dev

checkout source and compile
dpavlin@t61p:/rest/cvs$ git svn clone -s http://libnfc.googlecode.com/svn libnfc
dpavlin@t61p:/rest/cvs$ cd libnfc/
dpavlin@t61p:/rest/cvs/libnfc$ autoreconf --install
dpavlin@t61p:/rest/cvs/libnfc$ sudo ./debian/rules binary

install dpkg packages
dpavlin@t61p:/rest/cvs$ sudo dpkg -i libnfc0_1.4.0-0_i386.deb libnfc-bin_1.4.0-0_i386.deb libnfc-dev_1.4.0-0_i386.deb

modify pcscd configuration to recognize all readers
dpavlin@t61p:~$ diff -urw /etc/libccid_Info.plist.orig /etc/libccid_Info.plist
--- /etc/libccid_Info.plist.orig        2011-01-13 23:05:07.449342958 +0100
+++ /etc/libccid_Info.plist     2011-01-13 23:05:25.624371843 +0100
@@ -52,7 +52,7 @@
        -->
 
        <key>ifdDriverOptions</key>
-       <string>0x0000</string>
+       <string>0x0004</string>
 
        <!-- Possible values for ifdDriverOptions
        1: DRIVER_OPTION_CCID_EXCHANGE_AUTHORIZED

restart pcscd
sudo /etc/init.d/pcscd restart

test it
with touchatag sticker
dpavlin@t61p:~$ nfc-list 
nfc-list use libnfc 1.4.0 (r842)
Connected to NFC device: ACS ACR122U PICC Interface 00 00 / ACR122U102 - PN532 v1.4 (0x07)
1 ISO14443A passive target(s) was found:
    ATQA (SENS_RES): 00  44  
       UID (NFCID1): 04  cc  6b  d9  a1  25  80  
      SAK (SEL_RES): 00

read Mifare
mfoc -O dump | tee keys.txt