I'm starting tomatoes from seed and they look kind of leggy. Is there anything wrong with them?
If they seem strong, there probably isn't a problem, but you can minimize the legginess by taking them off a heating mat if you are using one and transplant to a slightly larger container. Tomatoes in particular tend to favor being planted deeply, so you can plant them almost up to their leaves. Plant them outside as early as possible and use Walls o' Water or floating row covers to trap heat and protect them at night until the night time temps go up.
While still indoors, you might also use a small fan on the low setting to send a gentle breeze over your plants. This tends to cause them to develop stronger, shorter stems.