Test strategy is a document which explain how to attack a 
application/software for testing purpose. In other word it 
describe the efforts to be carried out in order to certify 
the quality of software.

Test strategy--It is a company level document.it tells u 
how to approach testing process.
Test plan -- It ia a project level document.it tells u how 
testing should be carried out by following some rules and 
regulations.

Test strategy is an organisational level term and it is 
used for all the projects in the company.

the contains contains contains the followinf items
1.levels of testing
2.types of testing
3.test design techniques
4.configuration management
5.test metics
6.automation plan
7.list of automation tools

Test strategy is a strategic document which defines how to 
perform testing on an appliction in an efficient ,effective 
and optimised way

Test Strategy is the first and most initial document we need
to prepare in the STLC ...

We need to prepare Test strategy from the BRS and SRS
documents ...

Test Plan will come under Test Strategy ..
Test Strategy will give the basic and complete idea of the
test concepts related to current project.