The link that ZENRYAKU mentioned is a great resource for all sorts of maintenance issues and I'd definitely recommend checking it out. I'd especially suggest having a look at the "Transitioning to maintenance" section where you can find advice on how to shift from weight loss mode to maintenance mode.
Many people seem to find that maintenance is a bit like a science experiment that you perform with yourself. There is no one answer to the question of how many calories a person should consume on maintenance. Many successful maintainers, myself included, have found that gradually increasing your calories is a good approach to halting weight loss and levelling off. Also, the amount of calories that you need to maintain over time may increase or decrease depending on your activity levels, age and other factors so it's always a good idea to keep an eye on trends over time to see where you might need to make adjustments.
If you have specific questions about making your transition to maintenance, please feel free to start up a new discussion thread. Lots of people here have been in your shoes and can offer great advice and wisdom.
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