If you don't think you can edit your photos on a portable device, then you haven't worked yet with Photogene for iPad, a surprisingly powerful editor that you can buy in the iTunes store for $3.99.
This image for example, was captured with an Olympus PEN and a 17mm f/2.8 lens at Fort Point in San Francisco. I then went to a coffee shop and transferred the images to the iPad using the Camera Connection Kit. To create the cool look in the photo, I applied the "bleach" preset in Photogene, then uploaded to Flickr directly from the iPad.
In my spare moments, I've found myself playing with images in Photogene, just to get an idea of what's possible. It's a great creative process... in addition to getting your work done when you have to post a photo quickly.