Yet another blog

First you have to install jdk by running this command in terminal
sudo apt-get install sun-java5-jdk sun-java5-plugin

for jdk 6
sudo apt-get install sun-java6-jdk sun-java6-plugin

Then download netbeans ide from here

The downloaded file will be a sh file, most probably in your desktop

Now open the terminal(from Application->Accessories)

Then go to your desktop folder or the folder in which you have downloaded the installer file

cd Desktop

Then run this command, the last portion of the command will be the name of the file you downloaded

sudo sh netbeans-6.5-ml-javase-linux.sh


That's it, your installer will start and the next processes are as usual.

More detailed instructions can be found in Netbeans Wiki page