Ok, I played a bit around and I think I found the trick.
You need a Google Scholar profile for this, and you need to have your articles associated with your profile. I did this a long while ago, and don't remember how I did it, but it should be quite straigtforward. And it's not the point of this question.
- On "My Citations" page, you have a table with 3 columns: "Title / Author", "Cited by" and "Year". Scroll down until you reach your uncited article and click on its linked title.
- You arrive on a page that contains some details about the article and that you can edit, export or delete. Below the bibliographic data, you have a line that is entitled "Scholar articles". Hover this link and notice it ends with
- Copy this link (right click > Copy Link Location in Firefox looks like the easiest way to go) and save the long 20-digits number after the
cluster= part (something like
12909901205937540955). This number is the ID of your article in Scholar's database.
- Now go back to the list of your citations, and click on any number in the Cited by column. This performs a search for citations of an article with a citation. If you don't have any cited paper yet, check out step 8.
- Check the URL of this page: it ends with an other 20-digits ID of an article with citations after the
- Now replace this 20-digits ID with the one you saved in step 3 and press enter to load this new page.
- If you don't have any cited paper, take this link (hope it will continue to work in the future):
http://scholar.google.com/scholar?oi=bibs&hl=en&cites= and add your 20-digits ID at the end.
- On the page that loads, you'll see "Your search did not match any articles." Despite this fact, you have a "Create alert" link as described by batpigandme. This link will now allow you to create a citation alert for your article.
It's a bit tedious but at least it seems to work.
This works for your own papers, but not for papers by others (there will be no "create alert" link at the bottom on the left. For any random paper (including your own):
- Click the Save button under a search result that is pointing to the paper of interest (this adds that paper to your library)
- Open My Library, click on the article, and then scroll down to find "scholar articles" - that link (but not the one at the top) contains the 20 digit identifier you need - right click copy link and proceed as above (step 4 and following).