Google trends compares search terms over time. You can be a great way to gauge interest and popular ready for various search terms. Just like Twitter hashtags, Google also shows what the breakout search terms are and how they compare to each other.
I did a little comparison on the three major carriers in Thailand. The graph below shows the interest Google searchers have in the search terms Ais Thailand, Dtac Thailand, and Truemove Thailand. Also arise graph, so feel free to check back here anytime to see the progress.
To have some more fun, I did another search. In Google search trends you can also select the search country. The graph below is searches from inside Thailand for the search terms Samsung and iPhone.