In my day to day life, I have many dependencies on different things. Not exactly dependencies, but those things makes my life easy. Really easy. For example, Google's reader. There is many more things without which my life could have never been this easy. Let me mentions some of these things for which I am really grateful.
1) Google search, 'define:' of Google search, Google reader, igoogle & gmail
2) My Sony Ericsson w830i
3) Fever - 104 FMv
4) Microsoft's ctrl+c, ctl+x & ctrl+v