This move actually makes me LESS inclined to use Google to store my photos or documents. If I accidentally use up all of my space, I won’t be able to send or receive any e-mail!
I mostly used Posterous as a way to post photos and other content from my phone to Facebook and Twitter.
I have switched to Tumblr for single photos (using IFTTT to import the photos natively to Facebook) and Google+ for albums. Hopefully Tumblr will still be around in a year.