So, I'd like to report that this process is not working smoothly.
I made a deposit more than 36 hours ago, scanned and emailed my deposit reciept to MtGox, and the funds still haven't been credited. Several emails to their support team keep getting the same response: "We will notify you when your cash deposit is credited to your account."
ExchB credited my deposits within an hour most of the time, and never even once took more than two hours.
*sigh*
No big deal if the price stays where it is, but it sure will stink if it suddenly goes up 25% (which is quite possible considering the gigantic plunge the price just took).