It is good for a teacher to do research, much like meditation or praying, it is good for self-reflection. Language Research has blossomed over the last half centrury, and more so since technology has entered the picture. If anyone is old enough to remember doing statistics with a calculator, you will know what a boon SPSS was. But the tools for research in linguistics and ELT have been hard to find.
But no longer. Instruments for research into Second Languages (IRIS) are being collected and distributed using an open source system.
Read an interview with one of the prime movers, Emma Marsden, in The Language Teacher (hot off the press). IRIS offers a clearinghouse of online research tools for SLA. Many of the tools focus on collection and elicitation of language data.