[iBook] external monitor on iBook

[Nancy Lawrence]

Hi.  I finally got my best friend to switch and she wants to buy an  
iBook but she wants to be able to occasionally use it on an external  
monitor.  She is completely not tech-savvy and when she went to the  
local Apple store and told the Apple "Genius" this he didn't listen  
and went into great gobs of detail, so much so that I couldn't make  
any sense of it when she got back.  So I thought I'd turn to you all  
for help.

Can anyone tell me a quick and reliable place to go for which models  
can run external monitors with which cables, etc.?  I would really  
appreciate it because this information will make or break the deal  
for her to buy the iBook.

Thanks in advance,
Nancy