Do you want to testdrive SAP's new Eclipse-based ABAP IDE, the ABAP Development Tools for SAP NetWeaver?
Simply go to the update site of the SAP Development Tools for Eclipse and follow the installation instructions. This version of ADT requires at least an AS ABAP of SAP NetWeaver 7.31/7.03 SP04 (for details please refer to this blog post). Thus, you either already installed an approriate sytem or you may download the corresponding SCN trial version of SAP NetWeaver AS ABAP. In case you are using the AS ABAP trial version as backend, please ensure to configure the port of the HTTP service correctly (see ICM documentation). Otherwise some features of ADT might not work correctly, like calling the ABAP keyword documentation.
For a jump start with ADT after installing it successfully I recommend to read the ADT Quick Launch Guide or watch the ADT video tutorial. There is also an FAQ document available about ADT which might be of interest.