This small tools have a big features for those who want to extract information from PE files.

PEiD have its own special features:
1. It has a superb GUI and the interface is really intuitive and simple.
2. Detection rates are amongst the best given by any other identifier.
3. Special scanning modes for *advanced* detections of modified and unknown files.
4. Shell integration, Command line support, Always on top and Drag'n'Drop capabilities.
5. Multiple file and directory scanning with recursion.
6. Task viewer and controller.
7. Plugin Interface with plugins like Generic OEP Finder and Krypto ANALyzer.
8. Extra scanning techniques used for even better detections.
9. Heuristic Scanning options.
10. New PE details, Imports, Exports and TLS viewers
11. New built in quick disassembler.
12. New built in hex viewer.
13. External signature interface which can be updated by the user.

Well, I use it for long time and this is the great and fast tools for getting PE information without need to install anything.

PEiD can be downloaded from here:
http://www.peid.info