Android development team has released the new Android SDK Tool Revision 5 (r5) on early March this year (2010). This revision fixes some problems and bugs found on previous revision (r4). What i found usefull was it fixed the issue on fetching repository URL using SSL (https://dl-ssl.google.com/andr oid/repository/repository.xml) that mostly occured when downloading Android platforms into SDK or installing ADT on Eclipse.
For Eclipse users, SDK Tools r5 is designed for use with ADT 0.9.6 or later, so after installing SDK Tools r5, it is highly recommended to update your ADT plugin to 0.9.6.
Fixes and changes:by