It really depends on the industry and position. I'm looking for a driver position and submitted an online app to a company, turned off my computer screen, got up, stretched and my phone rang, it was the company I just applied to. Some places, as has been mentioned before, realise they have to act quickly if they want to fill positions.

Take it as a compliment, you have a highly desirable skill set that isn't common, if that makes them desperate, then every trucking company in the USA is desperate. Ok, bad example, they are.

But seriously, it's a compliment to you. They want YOU, and they want you NOW! before anyone else grabs you. This puts you in a pretty powerful position, don't forget that. Don't let it go to your head either though.