At the office, we have a "Christmas Cactus" that last year blossomed continously from Veteran's Day through Valentine's Day, and it looks like it will do so again this year! It's one of Dad's cast-offs - actually, it's a Bruni cactus, created from pieces she broke off of other cacti when dad moved them to a window that she likes to look out of! An enthusiastic St. Bernard can cause a lot of plant damage unintentionally!

They tend to blossom the same time every year, if yours hasn't blossomed, try moving it to a different window, changing the light exposure (and/or repotting it, because if you've had it so long it may be root-bound.)