Partition size and No. Reccomendations

[Vic Main]

Hi:

I've been trying to make sense (cents) of the different partitions 
being recommended by different sources.

One source says 4, another 3, and even just 2. (a 10GB for /, a 2GB 
for swap). One says 10GB is enough for the whole install, another the 
whole 100GB drive is necessary.

I have a 2 Gig swap, a 2 Gig boot, and a 30 Gig and 10 Gig both 
unassigned, and finally a 110 Gig ntfs partition on a second drive

It does seem that Ubuntu has access to all of the ntfs drives, so any 
material I need to store can go there??

I'm dual booting with windows XP.

Thanks

Vic