Update:
I have implemented a creeper plug-in. Creepers shouldn't affect terrain now. Be warned, they can still blow you up.
---
I have also checked the other mods. Mo' creatures CAN be implemented into SMP (survival multiplayer) however it requires that EVERYONE has the client-side mod, everyone who wants to play on the server would have to download something, and also I a lot of extra work on my part. I'm still confused about it honestly.
---
The creator of baby animals said that he is CURRENTLY working on an SMP version, but it wont be out for a while.
---
The dino mod guy doesn't have any information on an SMP version. I assume it's installation would be similar to mo' creatures, but Im not totally sure.
--
Single player commands doesnt have a specific bukkit plug in, but I can put in some other plugins that do the same stuff.
What commands on SPC do you want to have on the server? You can already give yourself items, so which ones do you want aside from that?