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I have an iMac 2008. I also use a linksys WRT54G for my wireless network at home.

Is it a good idea to change this router to AirPort Express? My connection will improve?

I also have a old notebook PC (not support "n").
 
Thank you everybody for the answers.

Airport Express users, is it possible to connect more than one USB device by using a hub or is it only able to handle one at a time?

Yes, it is possible to connect it to a USB hub. It does not support external harddrives though

I recently bought the Airport Express, and it works like a charm with my alu MB 2.0, havn't dropped the connection yet and my mother could have done the setup! ;)
 
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