One calendar and contacts everywhere!

Hi,
some time ago I've been looking for solution that would let me use one
calendar on my laptop, mobile phone but also every single PC with
Internet access. My first thought was to Use google calendar. The
problem is I don't like to use web clients (e-mail clients, calendars
etc.). I use Mozilla Thunderbird to read emails.
There is a Thunderbird add-on called Lightening. It provides nice
calendar and tasks module. The problem is that data is being saved on
the local computer. I found a solution - there is an add-on to the
add-on called Provider for Google Calendar. After installing this one,
all you have to do is to create the calendar (one or more) on the google
calendar site and give its XML address to Google Provider. To do it, on
your google calendar site choose settings, then calendars, click
calendar you want to use and then click one of two XML buttons and copy
listed URL to the Google Provider. That's it - you may use google
calendar in your Thunderbird.
Now it is time to tell you how I use calendars on my mobile. The
solution is quite simple - I have mobile phone with Android OS (it has
built-in google Calendar app). It also uses contacts from the google
server. I decided to share this contacts to my Thunderbird. It is very
simple. All You have to do is to install another add-on. It is called
Google Contacts. After simple process of configuration you may use your
contacts but be careful all you do with the contacts via Thunderbird
will effect on the google account so also on your Android mobile so
don't delete to much! :)