Yes, a picture speaks a thousand words but sometimes, when you've got something big to say, you need to hammer it home.
Whether you're advertising a multi-national or simply promoting your blog, images with text can create the required impression and the desired impact.
Keep your one-liner short and to the point, make sure the font is clear and colours contrast well with the image.
Don't forget to use description tags where possible - Google robots can read your mind but they can't read images.
All images on upicm.com are optimised for web use so all you have to do is add your text. Have fun!