In breach of various natural laws, yet another Sven Co-op update -- 4.07 -- is coming in just a few days' time! Planned for release on Friday, the 15th, this patch will include fixes for a couple of issues from 4.06, some general tweaks/improvements, and also the latest donor list (recent donors will receive their bonus features in this update).
Since a fair amount of time has passed since the release, this seems like a good time to publicly reveal the secret donor reward that was added in SC4.0B!
Once 'summoned' (you should be able to figure out how from the video), your personally-named Chumtoad will follow you about and attack enemies by expelling a poisonous cloud of gas. While the cloud is active, it also obstructs enemies' vision, reducing the accuracy of their ranged attacks. Chumtoads normally start with 100 health, and are particularly effective against zombies.
There are still about seven recent donors who we don't have valid Steam IDs for, by the way. If you donated after the Sven Co-op 4.0B release and have not received an e-mail specifically saying your Steam ID has been added, please go to this page and follow the instructions.
Anyone donating now should include their Steam ID with the donation for the best chance of getting the bonus features in 4.07. Anything after Wednesday night can't be guaranteed (until 4.1). IMPORTANT: Steam IDs are different from your Steam username, they look like this: "STEAM_0:1:23456". See this page for details.