The server will not be updated to 1.5 immediately, so you will need to stay on 1.4.7 for the time being to play on the server. It will most likely be around a week, hopefully much less for the 1.5 update on the server. You can see a changelog of the update here.
If you did upgrade, and want to downgrade, you can download one of SmokingCrops modded jars here. Just place it in your AppData/.minecraft folder!
# I will message the two users above with the gift card codes shortly #
Over the period of next week I will holda small giveaway for two $25 Amazon.com (US) Gift Cards. The contest will end Wednesday, March 6th Sunday March 3rd 7:00PM CST. I will make a list of users who post in this thread (you only get one entry) and I will randomize the list of names once to pull the two winners. Each gets a $25 Amazon.com (US) Gift Card...