Could people please give info about which brands/models depreciate the quickest and which depreciate the slowest. Thanks.

That question can have a lot of different answers. I tend to think from past experiences, those models that were mass produced for one reason or another tend to depreciate more than others. Some models that may depreciate quickly are Ford Tauruses, Explorers, Chevy Impalas, Malibus, Pontiac Grand Ams, Dodge Caravans, etc. you get the picture. These models are popular with the public and the manufacturer has produced more of these models to satisfy demand, and possibly because they may make more money by selling more of these models. Many of these models are also produced for rental companies which buy up huge blocks of these cars, many that are produced are also leased. Minivans in general also seem to depreciate quicker and now because of the higher gas prices, I am starting to see SUVs and other "low mpg" vehicles lose value quicker. A good way to tell which makes and models can depreciate quicker is to see what cars are on dealer lots , especially used car dealers and those that specialize in "off lease" and rental buy backs. They usually are a year or two old and can be for sale for up to 50% off the original sticker price.
Those that may depreciate slower tend to be "special editions" or a low production count vehicle. There are some models out there that could possibly fit that label such as certain Mustangs, Monte Carlo SS, Dodge Chargers,anything unique and "out of the ordinary". A good way to find info is to check the websites of Kelley Blue Book, NADA, Edmund's, etc. There you can compare values of cars, and see which ones retain their value longer.

the cars that depreciate less are mostly imported japanese cars like Honda Accord and Civic, Toyota Camry & corolla, Nissan maxima & altima etc.