my preferred website for adding text is http://www.picnik.com.
This is an easy way to edit photos and insert text. I personally prefer that the text be in Impact, but you really may use whatever font you want. Using all caps also isn’t mandatory.
Submit things to me here: http://spidermanspiderman.tumblr.com/submit
…and here is a long list of all the screencaps I currently have.
And thus ends my collection to this date. I don’t claim to own any of these. I just find them around the internet. Have fun!