The great thing about DSLR cameras is that they are in many instances compatible with some of the gear you might already own.
This is particularly true when it comes to lenses. Chances are that if you already have a film SLR, then those lenses might be compatible with a DSLR from that manufacturer. However, you shouldn’t assume that all lenses will be compatible, but it is worth asking the question since you could enjoy considerable savings.
If you already own a point-and-shoot camera, it can be a good idea to check the type of memory it takes since some DSLR camera models might also be compatible with them. While this probably will not be a major consideration since memory cards are now quite affordable than was the case previously, it could still be a factor to consider.