What a myriad of tools that are available. I looked at skype, logmein, and yousendit. Skype can be used to text with someone over an internet connection and is very useful in the tech industry with support. Logmein is used to log into a remote desktop. Yousendit is used for file-sharing and they host the files.
I looked at yelp in more depth. I will definitely use this when I travel. It has reviews for restaurants, shopping, etc. for all the major cities. I have used trip advisor in the past, but will also take a look at yelp. In order to really "test" it out, I took a look at the reviews for Chicago and found the info to be accurate.
Check it out.