I did an upgarde to b2evolution 2.4.6 this morning.
I can't login again.
It gave me this error:

Either you have not enabled cookies or this login window has expired.
I found the solutions;
Go to conf/_advanced.php

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PHP

I have added the subscribe buttons of RSS for my wordpress blog.I tried Add to Any Subscribe Button and Subscribe Sidebar plugin. "Add to Any Subscribe Button" can add your rss feed to almost all feed readers , such as Google Reader, My Yahoo!, Netvibes and Windows Live. But it will lead the reader to their smart menu. That is not somethings I prefer. I prefer there was some button in my blog. The reader can directly add my feed to their rss reader directly. Subscribe sider can do that. But I don't know why after I added widget into my page. There is an extra h1 tag on the plugin.
But that is easy to fix.
From

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I just found they changed the way to present the message too.
The old way:
"
Michael (XX:XX)
Hi
Michael (XX:XX)
Hi again.
"
The new way in 2009:
"
Michael (XX:XX)
-Hi
-Hi again.
"

I have just installed MSN Messenger 2009. It got a new interface. That is more fancy. There is a section at the bottom,"What's new?". You can see the latest changes of your friends' status. But I don't like it can't display the number of unread emails if the number is geater than 99. It will display "99+". I have around 300 unread emails. Then I never know any new emails arrived.

In PHP, you have $_GET and $_POST. In Joomla 1.5 framework, that is easy and quite similar with ASP.Net.

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JRequest, then you can access GET and POST.
More information, http://docs.joomla.org/Retrieving_data_from_GET_and_POST_requests