rw said:

We live in Massachusetts and put down a corn gluten pre-emergent weed
control product back on March 19th.

Although the lawn is still dormant, we've noticed some type of weed has
emerged (March 27). Can anyone identify what type of weed it is (URL
to picture is below) and the best way to get rid of it / prevent them
going forward (organic if possible).

http://www.addieryan.com/2006/2006March_LawnWeed.JPG

Looks a bit like speedwell (Veronica) to me. Perennial weed.
If you had it in the lawn last year, it will come back from the roots.
Pre-emergents only control weeds sprouting from seeds (annuals
or newly sprouting perennials).

--
Pat K. ('someplace.net' is comcast)

Any technology distinguishable from magic is insufficiently advanced.
(attributed to Don Marti)