Buying tax deeds according to things that I have read can provide a source of great profit. For example: here in Maryland, you must go onto the specific county website to access the list of homes that have defaulted with paying their taxes. The information that is usually listed is: the property address, the amount of taxes owed (which is the amount that you would pay for the property); the assessed value of the property and where it is located; sometimes it will provide info about the # of bedrooms/baths. What happens in Maryland is that there is a form that you fill out through the county website specifying which property you want to make a bid on. You can bid by Group (which is more than one property at a time- usually by city), or you can bid on an individual property. Some of the prices for these properties are out of this world (i.e. $200 for a property worth $150k)--these numbers are quite normal.
The catch to this is that once your bid is in, if it is the highest bid for that property, you then essentially own it; free and clear of any mortgages because the county wants to take these default-tax properties off of their hands. However, if the current owner of this property wishes to pay up their taxes to date...you cannot aquire the property, but your bid amount will be reimbursed to you. Their is a period of Right of Redemption...this is the time when the owner can pay their taxes and redeem their home. If you were to put in your bid today, the county will notify you tomorrow whether or not your bid was accepted. You must pay attention to where and when these deeds are being sold and purchased because it's usually not often...I believe that my county here in Maryland does this type of thing once a year.
Anyway, the profits seem unreal since you are able to invest, for most homes as little as $100 for a home worth $100k...free of mortgages. You can then rent them out, fix them up and resell--for the ARV! I will definetly be putting in my bids next year.
Well, this is my understanding of the process...I hope this helps a bit.