The Dev Team has just released the RC10 version of redsn0w 0.9.6, an update that should solve all the bugs of the previous versions but also contains the option to activate the animated boot logos on our terminals. The Dev Team also solved the problem with the silent button which was apparently caused by the fact that it was not correctly implemented in redsn0w, but now everything should be ok. You can run this new version of redsn0w without problems over the old one because to solve the problems. You install animated boot logos from Cydia and customize them from Settings>Bootlogo.
You can download the new version of redsn0w from here: Windows, Mac OS X. Jailbreak tutorial you can find here.
Those running redsn0w may have noticed we enabled too many Settings options in some versions of the jailbreak (for instance, what you want your side switch to do, even if you have no side switch because you're not using an iPad). Release rc10 of redsn0w corrects that (you can just run it over your existing jailbreak...be sure to de-select Cydia to avoid package conflicts).
Along the way, we've also added the option to enable boot animations...these animations can be installed via Cydia, but be sure to select which animation to use via the Settings->Bootlogo setting after you've downloaded an animation (and again , you can just run rc10 over your existing jailbreak...be sure to de-select Cydia to avoid package conflicts).
UPDATED: It appeared version RC11.