I think it's Saponaria officinalis/Bouncing Bet.

So do I, jaynine.

Thanks! So it's more of a wildflower or an herb, then? I was a little disappointed when I saw the flowers. Unless it blooms more heavily later. Does it have any garden value?

It may not look like much to you, but have you smelled it? That's one of the reasons I wouldn't be without it...a personal favorite for it's fragrance.

...its fragrance.

Actually, I haven't! :)

I'll go do that.....

Commonly seen because people are planting it deliberately, especially the double form.

"Garden value" is like beauty, it is in the eye of the beholder. But if curious about how this one has been used, check out the Plants for a Future entry.

FataMorgana

Here is a link that might be useful: PFAF.org

That one looks a little unhappy; usually Soapwort is bigger and has more flowers than that. (I do think that's what it is, though.)

WW

You were right, and it does have a nice fragrance. When I went out to check it, I saw that the white flowers were now a light blush pink, and it was blooming more. Could be it is just small.

Those who have it: does it spread to make a colony by seeding itself? Or spread by runners?

Linnea56, the link below may be of some help.

Here is a link that might be useful: Saponaria officinalis