Build log could be improved by adding some capabilities to it. As a first step
adding some timestamp at regular interval (5min?).

Then here is a discussion to make the log more interactive:

http://www.nabble.com/Timestamp-on-output-td18509930.html#a18509930

Kohsuke:
I've been thinking that adding more interactivity in the console output
would be very valuable. Such as doing folding, jumping to next/prev
target (if it's output from Ant), coloring, hyperlinking from stack
trace, etc.

If we could define some kind of annotation mechanism...