Like a restaurant? Tell the world while you’re still finishing your ravioli.

Citysearch is taking on Yelp in the fast growing iPhone software space. Both companies now have their own iPhone apps. Citysearch is brand new; Yelp has been out a scant two months ago and is already the iPhone’s third most popular travel app (after Urbanspoon and Google Earth).

Both Citysearch and Yelp use the iPhone’s GPS to let you find nearby restaurants, bars, clubs, hotels, and stores. You can rate and review the places you visit too. Soon you’ll be able to take pix and movies and upload those too.

Note to wait staff: really mean it when you say “how may I serve you today?”