Cloud Computing

It is a style of computing in which IT-related capabilities are provided "as a service", allowing users to access technology-enabled services from the Internet ("in the cloud") without knowledge of, expertise with, or control over the technology infrastructure that supports them.(WIKIPEDIA)

So in broader sense we can say:

1. Infinite computing resource
2. Available on demand
3. Pay per use
4. Delivered across the Internet

The concept incorporates infrastructure as a service (IaaS), platform as a service(PaaS) and software as a service (SaaS)

For ex gmail is not a cloud computing service .From the end-user perspective it's a hosted application, it's software as a service (SaaS)

for more information on CLOUD COMPUTING try this:

1. http://sg.sun.com/offers/details/cloud_computing/?cid=tc234_sem_in
2. Wikipedia
3. Infoworld

UBUNTU

This is the Linux for human beings(tag line of ubuntu). Every Beginners should opt for ubuntu , this is the best Linux to start with / switch to . Ubuntu is sponsored by the company Canonical Ltd.,owned by South African entreprenuer Mark Shuttleworth. Currently the latest version of UBUNTU has arrived, it's UBUNTU 9.04(Jaunty Jackalope) you can download the same from here 

Also you can request an cd which is free of cost  from ubuntu.

So start using UBUNTU and change ur lives

How To Restore The grub

1. Boot from a Live CD, like Ubuntu Live, Knoppix, Mepis, or similar.

2. Open a Terminal.

3. Type "grub" which makes a GRUB prompt appear.

4. Type "find  /boot/grub/stage1". You'll get a response like "(hd0)" or  "(hd0,3)". Use whatever your computer spits out for the following lines.

5. Type "root (hd0,1)"   or  "root (hd0,3)".

6. Type "setup (hd0,1)"      or     "setup (hd0,3)"       . This is key, Other instructions say to use "(hd0)", and that's fine if you want to write GRUB to the MBR. 

If you want to write it to your linux root partition, then you want 

the number after the comma, such as "(hd0,3)".