OK, LJ brain trust, a question on Jewish liturgy

[rhu]

I have heard that some people say an "Al hanissim" on Yom Haatzmaut and Yom Yerushalayim. I am curious about the texts that are used, where those texts originated, and how widespread the custom is becoming. I've done a Google search (but I don't know whether what I've found is just one person's invention or a wider community's minhag) and I've seen the text in Siddur Sim Shalom (but I don't know the provenance of that text).

Thoughts? Can you pass this on to your various networks?