There are many ways to do download YouTube videos. You could install some software or use a website to download and convert videos, but the easiest way is to install the firefox plugin.
If you don’t use firefox (here’s why you should), then there are many sites out there that let you download YouTube videos. I recommend these:

http://javimoya.com/blog/youtube_en.php
http://www.downloadyoutubevideos.com/
http://www.downloader9.com/

As to software for downloading and converting .flv YouTube and Google videos, YouTube Downloader seems to be the best.
See for yourself which one of the methods you like best and happy downloading!
More Cool Windows …

The Remote Desktop Connection utility is a very useful tool, especially if you need to access your work computer at home, or vice-versa. It lets you create a direct connection between two computers, one able to control the other. Here’s how it’s done:
Step 1: Setting up the Remote Computer account
Log in as administrator on the computer you want to access over the connection. Go to Control Panel -> User Accounts and decide which user’s desktop you want to connect to. Click the account and choose Create Password. …

Easter eggs are those mysterious flaws and hidden stuff made by programmers that they get sacked for. Even your Windows XP has some:
1. Bush hid the facts??
Open up notepad and type: bush hid the facts
Save it and reopen and you should see 9 squares instead of the text!
2. Microsoft Sam slang
Open Narrator from Start > All Programs > Accessories > Accessibility > Narrator.
(NOTE: You need to set the voice to Microsoft Sam for this to work.)
Open notepad and type crotch.
Make Sam say it by pressing Shift + Ctrl + Space. …

[This tutorial might be inaccurate, try at your own risk]
There is a Startup Delay value in the Registry Editor that, when decreased, will make your XP start up faster.
To to this go to Start > Run and type regedit to open up the Registry Editor.
Navigate to : HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ContentIndex and look for an entry named StartupDelay. Change the default value of 4800000 to 40000 and reboot for the changes to take effect.
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This is a good idea if you want to save both desktop and hard drive space.
To remove the Recycle bin from your desktop, go to Start > Run and type gpedit.msc
Go to User Configuration > Administrative templates > Desktop > Remove Recycle bin icon from desktop
Enable it and reboot or type gpupdate.exe into the run box to apply changes.
If you want to completely remove the Recycle Bin, go to Start > Run and type regedit.
Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\BitBucket/C and open NukeOnDelete. Change the value to “1″ and reboot.
More Cool Windows XP …

So, basically this nifty little piece of JavaScript will make all the images dance around on any website currently open in the browser. All you need to do is to insert the following code into the address bar and press enter:
javascript:R=0; x1=.1; y1=.05; x2=.25; y2=.24; x3=1.6; y3=.24; x4=300; y4=200; x5=300; y5=200; DI=document.getElementsByTagName(“img”); DIL=DI.length; function A(){for(i=0; i-DIL; i++){DIS=DI[ i ].style; DIS.position=’absolute’; DIS.left=(Math.sin(R*x1+i*x2+x3)*x4+x5)+ “px”; DIS.top=(Math.cos(R*y1+i*y2+y3)*y4+y5)+” px”}R++}setInterval(‘A()’,5); void(0);
This won’t harm the site or your browser and you can close it and reopen to view it normally.
If you feel very angry, you can use …