So, if anyone is wondering is it possible to run pyload on new My Book Live drives, i can say - Yes it is!
Installation was quite easy.
That's how I did it :
pyLoad install on MyBook Live - short tutorial
/version 1.0/ , updated in 27.02.2011 due to changes pyload team made in latest versions
1. enable ssh access to MBL thru hidden webinterface setting
(Use http://mybooklive/UI/ssh (case sensitive) replace "mybooklive" if you have renamed it to something else, or replace it with its IP address.)
2. Log in with putty or other similar programm using root account (default l/p is: root / welc0me)
3. Enter 'apt-get update'
4. Enter 'apt-get install screen mercurial python-openssl python-crypto python-pycurl python-imaging python-django tesseract-ocr'
(Note: due to changes pyload team made in latest versions you don't need python-django anymore, so you can exclude that from installing to save space on your MyBookLive system partition)
5. (optional step) Create new shell user either from webinterface or using 'useradd' command 'from which you will run 'screen' and pyload inside it. (or just run from default root account if you don't care about possible security issues). If you created new user, don't forget to add it in /etc/sshd_config file, becouse by default ssh access is allowed to root only. After that restart ssh service.
6. Run hg clone https://bitbucket.org/spoob/pyload
(with this step you will get latest developers version of pyload)
7. Start 'screen'
(or you can just don't use it if you plan to use pyloads daemons mode, but for first when you running pyload I reccommend that you use pyload without daemons mode, becouse it will give you more info what's going on when you add some files or when there is errors).
8. Run cd pyload ; python pyLoadCore.py -s
setup will ask you following:
Would you like to configure pyLoad via Webinterface?
You need a Browser and a connection to this PC for it.
Start initial webinterface for configuration? ([y]/n):
Is it important that you choose NO (by pressing n).
After everything is done, move to step 9.
9. Run 'python pyLoadCore.py' or if you planning to use its daamons mode, then start it with python pyLoadCore.py —daemon
10. After executing part 9, pyload should be running and you can access its webinterface to make adjustments in configs, add/delete files etc). Use http://yourmybookliveIP:port , where port is port number which you specified in setup. Default port is 8001.
p.s. From time to time is it wise to check if there is any updates made. Do this by using "hg pull -u https://bitbucket.org/spoob/pyload" inside pyload directory. It will update version to latest.
p.s.s. If you need to kill pyLoad then just press "ctrl c" if you run it without daemon's mode or if use daemon mode, then do killall python (of course if you run other aplications who uses python (for example SABnzbd), then don't use killall but instead use 'ps aux | grep python' and it will give you pyload process PID number which you can kill using 'kill -9 PIDNUMBER'