Pidgin is an all inclusive IM utility. If you have Gmail, Hotmail, AOL, Yahoo! (and many more) accounts and chat with all of them, then this is the tool for you. It will let you communicate on all of those through one interface.
http://www.pidgin.im/

There are some good ISO mounting tools out there like Alcohol. But they cost too much when compared to this next freebie. It is from Microsoft themselves. They don't support it, but it is an extremely small and functional tool.

Readme for Virtual CD-ROM Control Panel v2.0.1.1

THIS TOOL IS UNSUPPORTED BY MICROSOFT PRODUCT SUPPORT SERVICES


System Requirements
''''''''''''''''''''''''''''''''''''''
- Windows XP Home or Windows XP Professional

Installation instructions
''''''''''''''''''''''''''''''''''''''''''''''''''
1. Copy VCdRom.sys to your %systemroot%\system32\drivers folder.
2. Execute VCdControlTool.exe
3. Click "Driver control"
4. If the "Install Driver" button is available, click it. Navigate to the %systemroot%\system32\drivers folder, select 
VCdRom.sys, and click Open.
5. Click "Start"
6. Click OK
7. Click "Add Drive" to add a drive to the drive list. Ensure that the drive added is not a local drive. If it is, continue to 
click "Add Drive" until an unused drive letter is available.
8. Select an unused drive letter from the drive list and click "Mount".
9. Navigate to the image file, select it, and click "OK". UNC naming conventions should not be used, however mapped 
network drives should be OK.

You may now use the drive letter as if it were a local CD-ROM device. When you are finished you may unmount, stop, and 
remove the driver from memory using the driver control.

Here's the download link:
http://download.microsoft.com/download/7/b/6/7b6abd84-7841-4978-96f5-bd58df02efa2/winxpvirtualcdcontrolpanel_21.exe

– Main.FredPettis - 25 Mar 2009