My 14 month old just had his blood test results back, and while his hemoglobin levels are in the normal range, they're right on the bottom of the range. This surprised us some, because he's a voracious meat eater; last Friday he had 5 ounces of prime rib, for example, and he regularly eats plenty of almost everything we give him. Not necessarily every day, but on balance he's a good eater, and in particular on the meat side of the spectrum. He also does a pretty good job eating green vegetables, like green beans or broccoli.
We know that we could get iron drops, but we tried those for a while on our older son and he hated the taste (for good reason, iron tastes terrible in solution) and it put him off of vitamins entirely for a long time.
Are there other things we can do to try and increase our toddler's iron intake? He eats 'normal' food (whatever we're having), and mostly has fresh fruit or cheese/yogurt for snacks. He is a good (non-picky) eater, and rarely has to be encouraged to eat more of anything.
Edit (5/27/14): Started to use the spinach smoothies, those have gone over very well - no complaints about the flavor. One thing I've noticed as I've paid attention to some of the comments/answers below is that we have a lot of dairy with our iron containing products, so that's something to pay a lot more attention to.