There are a lot of articles about printing on the iPad or iPhone. I have not found too many great solutions. I was reading an article on the ipad today and wanted to print it out for reference.
After trying a few apps I landed on using the HP iprint application. You are only able to print photos with this app, but I just took a screen shot and printed it. Not a great solution but it worked. I can see a great opportunity for a nice inexpensive print app.
I did try active print but it had too many things to configure
In the future I will just send the item I want to print to my email