As of this writing, the BookLikes functionality we all depend on - the automatic importing of new books into the database when we use the search function - is 'under review'. That means that for the time being books have to be manually added using the Add New Book button, OR
Use the Shelve It widget. This widget currently works only with Amazon.co.uk, but the UK site has almost all the same inventory access as the other Amazons, so other than remembering to go to .co.uk instead of .com, or whatever your default may be, this might be a viable way to add books to the database faster.
So where is this widget, how do I install it, how do I use it?
Turns out finding it is the hardest part, because it hides in plain sight. Go to your shelf page. You'll find it there on the top right. It looks like a small book. Drag that to your browser bookmark bar (you might have to turn this on in your browser settings).
That's installation taken care of.
To use it, simply go to http://www.amazon.co.uk and search for your book. Once you find it, click the Shelve It link that's now in your bookmark bar. There will be a small pause and depending on which browser you use, you might see it starting to load another page. It should then take you to the new BookLikes book page for that book. Done. Imported. Now you just have to remember to add it to your shelves.
The shelve it function does not, at this time, bring in the book cover. If you think about it, when you're on the Amazon page, before clicking the Shelve It button, drag the cover to your desktop (or screenshot it, whichever you feel comfortable doing). After you hit the Shelve it button and it takes you to the new BL book page for that book, you can "Add Cover" and upload the cover too. This will make everybody's day.
If for any reason clicking the Shelve It button takes you directly to the BL dashboard instead of the book page, the import failed. Make sure you're on the Amazon.co.uk site, not any of the others, and try again. If that doesn't work uninstalling/reinstalling it might: drag the widget off the bookmark bar (which uninstalls it) then go back to your shelves and drag it back on. Try again.
Happy importing. :)