The event was relatively well covered by local media (in that they talked about it on tv, not that they put it in context or examined the racist and bad public policy behind the program), check out these stories:
ABC 13 coverage (this one has a poll on if you support 287g. Vote no!)
Houston Chronicle (the version in the printed edition has a quote from Eric of SDS!)
Houston Press Hair Balls Blog (by Liana Lopez of the Nuestra Palabra crew)
Local and regional groups fighting 287g and for immigrant rights, including SDS, are meeting today and are going to be working on developing strategies to try and document the impact this will have on Houston families, the expenses this will place on Harris County at a time when they are cutting social services, and the likely increase in racial profiling that will result.
In Irving Texas, when the local police entered into a CAP agreement (a similar program to 287g that gives access to immigration records in their city jail) with ICE in 2006, arrest records have shown an increase in arrests of Latinos for petty offenses. The University of California at Berkley Law School wrote a report [download pdf] that exposes the expansion of racial profiling that took place once they reached an agreement with ICE.