Hi.
I believe the list would be a bit more readable if the "payload" column used a fixed-width font.
Also, separating payload length information from payload data might help keeping data vertically aligned (useful when eyeballing similar payload data on multiple lines to spot small changes).
Bonus points for providing a way to change font size so more data can fit on a single screen (I use a netbook for capturing, there is not much room in 1024x600). Only changing list font should be enough.
[EDIT] I believe icons will become a problem for the bonus point... Maybe there is a way to tell the icon widget to scale to available height.