The latest release of Ubuntu is 9.04 Jaunty Jackalope available in the normal desktop and server 32-bit and 64-bit editions. But Canonical has something  new this time around is the Netbook Remix edition designed especially around of course netbooks.

Download

*Download Page*

Change log:

• GNOME 2.26
• X.Org server 1.4
• Wacom tablet hotplugging
• New style for notifications and notification preferences (Notification Preview)
  
• Boot performance
• Linux kernel 2.6.28
• Ext4 filesystem support
• Cloud computing
• Turn-Key mail servers

System Requirements:

• Desktop & Laptop

  • Required

    • 300MHz x86 Processor
    • 256MB Ram
    • 4GB HDD Space
    • VGA @ 640×480

  • Recommended

    • 700MHz x86 Processor
    • 384MB Ram (With Compositing)
    • 8GB HDD Space
    • VGA @ 1024×768

• Server

  • 300MHz x86 Processor
  • 64MB Ram
  • 500MB HDD Space
  • VGA @ 640×480