SourceTree is a great tool for managing git sandbox.
A small enhancement that would simplify viewing diffs is the abillity to ignore whitespace. Frequently I enclose a section of code in a block (if, loop, or for HTML <div>). This causes a whole section of code to be indented. Your Internal Diff View shows many lines changed, although only the first and the last line in the section are the real changes. I already use an external diff tool to verify that only whitespace has changed, but this takes a little extra time when reviewing changes.