[O] Filtering agenda by tags.

[Radosław Grzanka]

Hello,
  I have another problem which I fail on resolving.

Let's say I have a org file

--------------
#+FILETAGS: work

* Do something at work
* Do something at the internet    :internet:
--------------

and another file:

--------------

* Do something at home            :home:
* Do something at the internet    :internet:
* Some other untagged task

--------------

I'd like to have two agenda views:

1. should show things I can do at work and internet and untagged tasks
2. should show things I can do at home and internet and untagged tasks

I fail with defining custom agenda views. I've browsed google and 
already tried:
- org-agenda-filter-preset - but that seems not to support "or" (maybe 
I'm missing something?)
- org-agenda-skip-function - which I found googling around - with regexp 
like '(org-agenda-skip-subtree-if 'regexp ":work:")' - but that seems 
not to support "inherited" tags.

I'm using latest git checkout org and emacs 23.3.1 on windows.

Thanks for any tip

Radek.