My impatience and the website's speed don't get along too well. The windows client does a solid job for taking turns but I find using the website for communications straining. The Trello board gives off a pretty orphaned impression, so I'll leave my thoughts here:

1) The easiest (?) fix would be increased speed for the website.

2) How much work would it take to implement API for the communication features like game comment and player messages? This would enable off-site solutions.

3) Emails. I use a separate Gmail account for gmr mails and that works pretty well for me. The killer feature would be the possibility to answer to comments and messages. This would serve all my communication needs.
As a minor tweak I wish the turn notification mail-topic would include the game number or name. As it is, they get grouped weirdly.

4) Instead of a custom made comment+pm system, could it be an viable alternative to reuse an existing? Steam maybe? This might save some work and take load off the server.

5) On more general terms: Why not open source all of it?