Houston Economic Data
http://www.houstonnwchamber.org/virDirEditorAssets/HoustonNWTX/chamberAccess/docs/Eco%20Devo%20Docs/jankowski%20Presentation%20for%20Northwest%20Chamber%20Economic%20Outlook.pdf A compilation of good specific data from reliable sources such as the BLS and Texas Workforce commission, presented in a clear and organized fashion. One drawback is that the data is from 2012.
The economy archives of houston.org has the same sort of data as the source above however the sources are sometimes clumped together making it difficult to group a data point to an exact source http://www.houston.org/pdf/research/quickview/Economy_at_a_Glance.pdf -- a full report containing many relevant statistics concerning Houston's economy
SBA business data and statistics- links to many economic indicators a majority of which are useless as they typically are not just concerned with Houston.
http://stats.bls.gov/eag/eag.tx_houston_msa.htm monthly employment in specific fields with annual percent changes
http://www.dallasfed.org/assets/documents/research/indicators/hou/2015/hou151210.pdf
somewhat interesting data and indexes
Kauffman index puts Houston as the eighth city in the United States for startup activity