Most suitable operating system

Linux and Unix-Like Ubuntu
1

I have a Toshiba Satellite 1135 laptop, and i want to install a fedora core edition in my external USB hard drive.
I have
Intel celeron 1.8 ghz processor
256 mb ram.

Please suggest if there are other suitable linux OS which would be better than fedora core.

2

Try ubuntu 7.10

3

You should be pretty much ok with any distribution on that hardware, although if you could get to 512MB of RAM you would have a lot more capacity to deal with bloated applications.