Any of Leslie Sansone's Walk Away The
Pounds dvd's are fun and although easier than something like Kickboxing or TaeBo they do give you a great
cardio workout - if you work it

I personally like the Walk and Jog DVD - its intervals of fast paced walking and jogging of approximately 2 mins each (sort of marching on the spot and 4 steps forward and back). This one is equivelant of 2.5 miles in 30 minutes, but there is a huge range of other DVDs.
Now if you want fun but not so easy I'd recommend Jeanette Jenkins (The Hollywood Trainer) Kickboxing DVD
Michelle