My one request would be to have a more sensible version of webhelpers.date.distance_of_time_in_words helper.
http://gist.github.com/240045 (you're more than welcome to use it if you like).
I submit that the current implementation is more granular and flexible, but the code that's required to run it is complex, overwhelming and hard to understand. I think this approach (which Django has a similar one for) covers more than 80% of the use cases in less than 20% of the complexity.
I've always seen webhelpers as a relatively minimal and concise collection of tools that help cut that 80/20 utility/effort ratio. I think this addition or modification would be a good candidate.
P.S. It's possible to do a wrapper to give this default behaviour on top of the current implementation but the underlying complexity of the code to achieve that seems overkill and makes me feel dirty.