If you need to do some basic photo editing like resizing, cropping, adding text or even converting file formats, the website www.picnik.com is one very easy option.

Their free services give you all of the above options plus many more.  Picnik also offers a premium service for under $25 a year however I have found everything I need to do is available with the free account.

One aspect of Picnik I sometimes overlook is the service is an editor and not designed to start from scratch.  The price is right (free) so try it yourself.