A few interesting ways I keep an eye on longer term technology trends.
Google Trends: php, coldfusion, java, .net, ruby (This one has some problems, as “java” comes up for the country too…)
Indeed (job listing aggregator)

| php, coldfusion, java, .net, ruby Job Trends | php jobs – coldfusion jobs – java jobs – .net jobs – ruby jobs |
Drill down to Java ORM frameworks (and JDBC itself)

| hibernate, jdbc, gorm, simpleORM, TopLink, ActiveObjects Job Trends | hibernate jobs – jdbc jobs – gorm jobs – simpleORM jobs – TopLink jobs – ActiveObjects jobs |
Tags: stats
Interesting that jobs seemed to go up when the economy tanked. It also looks like Flash is beating everyone on Google Trends: http://trends.google.com/trends?q=php%2C+java%2C+.net%2C+ruby%2C+flash&ctab=0&geo=all&date=all&sort=2.