There is an apps called filer that can let download files, PDFs, movies, etc.

But,,,, The iPhone 4 will not resolve your 3G need.
On some forums I read the possibility to make a private wifi LAN using your iPhone and/or your MacBook when you are on the road, but not tested by me, because at last I prefer to bought the 3G iPad. For the thinking iPad bayers: if you have kids ...

Hi too from Spain ; ))

Just search for pdf2word on google for example.

There are many tools free or pay apps than can use, the most I know are for Windows, for example:
http://www.freedownloadscenter.com/Busi ... erter.html
Basically its convert to RTF format that word can open too.
Hope help you!
regards,

Varela
Madrid, Spain.