There is no simple answer to that. It depends on the sizes of the files, as they can be different sizes.
128
No, a 4MB flash drive will only hold about two average sized pictures. Documents vary in size a by huge amounts so it is hard to tell but it would probably not hold more than 20 documents. A 4GB flash drive(there is an enormous difference between megabyte and gigabyte) will hold about 2000 average sized pictures though.
becaus e i can be botherd
About 8000
to save documents
Yes, many do.
Sadly, no, since the iPod Nanos will not take powerpoints, word documents, and many other things, and iTunes won't help you do it either.
2500-3000songs
at least 3.
It depends on how many gigabites it has like 8 gigabites can hold about 15 movies.
The amount of songs a 8 Gb USB flash drive can hold depends on the size of the songs. It will hold approximately 2300 average sized (3.5 Mb) songs.
Either drag items directly on to the USB from their location in your documents, or (if using Microsoft) click file, save as, my computer, and select your USB.