You may already know that VS.Net design time support has started a long time ago and didn't have too much support since then.
Now that Npgsql release 2.0.12 is out, I want to put more attention to finish a version which adds design time support. I noticed that this is the biggest missing feature in Npgsql and I want to fix that. Npgsql users deserve to be able to use VS.Net design time support to help them create better apps which access Postgresql databases.
Although I can't give any concrete timeframe of when it will be available, I want you to know that I'm focused on this feature and it is not stalled. I hope to be able to give you more information soon.