Did you update?

With the great decrease in population on the server, I've been trying to find a legal way for people to downgrade if they updated by mistake.

http://assets.minecraft.net/1_3_2/minecraft.jar

The link is the 1.3.2 file from minecraft.net directly. Download and drop it into your %appdata%/.minecraft/bin directory. If you do not understand that...
On windows (look up for your own os type, sorry guys).
Open any folder that shows an address bar at the top (not a webbrowser!).
Click in and clear out what is shown there. Type %appdata% and hit enter.
Open .minecraft, then open bin.
Move the downloaded minecraft.jar file into that directory. Done.
Start your client, tell it not to update. Join a server. Have fun!

Note: If you opened/created any SSP worlds after you updated to MC 1.4.x, don't open them after the downgrade, until you update again. Most cases, your client will crash if you attempt.

Please read the post beneath this for other important information.

Happy Halloween!

Edit:
Some people are having issues connecting to any server on either 1.3.x or 1.4.x. I looked around and some people are finding this topic useful.  If you or someone else edited a hosts file on your computer at some, take a look at the following.

For windows (google how to on Mac or Linux).
Go to C:\Windows\System 32\drivers\etc
There is a file called hosts. Open it in notepad. You may need administrator permissions to do this.
If there is any lines of text, remove any line of text stating minecraft.
Save the file. Restart your browser if you have it open.