Hi,
First of all, I must say this site is quite remarkable! Not only it is very addictive and instructive, but it is also well designed and maintained.
I only have one minor entreaty to address: is it possible to add a filter that would show only the (solved) problems where one posted a comment? Or, alternatively, to add an additional icon in the last column of the table (containing the link to the forum), like the locked/unlocked/paper icons?
Thank you guys for offering us such a great time with Project Euler!