@MisterM: It Allows you to create a line in a text file that contains fields that you can choose (word, reading, English, sentence, sentence with word removed and a few others). The text file can then be imported into Anki.
So I will generally read an article online (you can also open text files and PDFs with a browser if you have books in those formats) and mouse over the words to see the definition (also supports j-j dictionaries) and hit a key (default is “s”) to add that word to the specified text file. When I’m finished with the article, I import the text file into Anki to create cards for all that vocab at once. Then I go into the text file and delete everything so its fresh and clean for the next time I sit down to read.
I should also mention that you can set it up to automatically create cards in Anki without having to do the import but I found it hard to use for some reason (I can’t remember why). Also, I’m not sure if this still works with Anki2.