I've got 2 laptops and 1 desktop PC along with 1 Palm. They all have ballistic software on them and occasionally one laptop will go to the range when testing. This facilitates note taking, spreadsheet usage if needed etc. etc.
However, when hunting or just out shooting I only take the Palm. All I need is the ballistic software and it is the same software as on the desktop and runs just fine on the Palm and so far I haven't found a shirt pocket the laptop will fit into.
I say Palm, some say Pocket PC. They all accomplish the same thing.