I've been working on identifying and better understanding the different segments of the IT business in Greater Philadelphia. There are obviously key technologies, applications, and vertical markets which drive much of the activity here. There are also phrases and acronyms that people use to refer to these things in shorthand. I know it can be confusing to people who are generalists (as I am) or specialize in certain areas, so I thought I'd build a little glossary of terms that seem to be most important here.
Right now it is based on Wikipedia entries, which are good in some cases and not so good in others. If anyone has suggestions on better sources, don't hesitate to let me know. This list will grow over time, though I intend to keep it as targeted to Philadelphia as possible. It will be posted on the right sidebar.

Enterprise resource planning(ERP)

Business process management(BPM)

Service-oriented architecture(SOA)

Software as a service(SaaS)

Cloud computing

Business intelligence(BI)

Customer relationship management(CRM)

Supply chain management(SCM)

Governance, Risk Management, and Compliance (GRC)

Product lifecycle management(PLM)

Business rules

SAP NetWeaver

SAP Business ByDesign

Electronic health record(EHR)

Clinical Trial Management System(CTMS)

Bioinformatics

Electronic data capture(EDC)

Agile enterprise

Thin client

DOCSIS

Set-top box

Verizon FiOS

Network neutrality

Passive optical network (PON)

Tru2Way

Enhanced TV Binary Interchange Format (EBIF)

Switched Digital Video (SDV)

IPTV

3G

3GPP Long term evolution (LTE)

Femtocell

Radio-frequency identification(RFID)

Ruby on Rails

Microsoft .NET Framework

Microsoft Silverlight

Microsoft SharePoint

Content management system(CMS)

Global Positioning System(GPS)

Geographic information system(GIS)

Spatial analysis

MicroStation

Location-based service(LBS)

Smart card

Wi-Fi

WiMAX

Voice over Internet Protocol(VoIP)

Project portfolio management(PPM)

Search engine marketing(SEM)

Organic light-emitting diode(OLED)