MACBook Notebook or Not?

My wife would like a smaller laptop, say 15 inch screen or less (more
like 13.3) and light weights as she does a fair bit of travelling.   We 
currently own an older Inspiron 1150.
I am a Intel guy myself. I haven't done any research at all so I thought 
I
would start off in USENET.

Her needs are fairly basic. She needs to run Word/Excel and other
spreadsheet programs and online manuals from work.  She needs WiFi
access and for me, when I occasionally use it I would like a decent
CPU/Speed/ and hard drive size to install navigation software.  Firewire
is a nice to have. Neither of us like hot running laptops.

I was thinking of getting her a Macbook or one of the thin ones that's
on the commercials.  I dunno how much that one is.

I welcome your recommendations.  However, in going with a MAC with an
Intel CPU, can this machine run XP or Vista and does it come with
Windows Software?  What about drivers for Windows (either version)?

Thanks