I have an arduino uno. And I must say I am extremely impressed.
I intend to get a due to play with, but have a couple of questions:
1: If I install the 1.5 software for the due, can I also use it with the uno? Are the drivers the same?
The latest IDE will support both the Due and AVR based boards. Driver installation is a seperate issue that you deal with the first time you plug a new board into the PC, just study the IDE installation instructions carefully for board driver installation.
2: If not, does the software need to be installed on different computer? Can 1.0 and 1.5 coexist on the same computer?
While the latest 1.5 IDE will support all 'official Arduino' boards you can have multiple IDE versions installed on the same computer for legacy reasons for use of older library support, etc. I have both version 22 and version 1.0 installed presently. But no Due board yet so I haven't had to deal with 1.5 yet.