Updated the README.

README.markdown

@@ -5,9 +5,13 @@
 Predis is a flexible and feature-complete PHP client library for the Redis key-value 
 database.
 
-Predis is currently a work-in-progress and it targets PHP >= 5.3, though it is highly 
-due to be backported to PHP >= 5.2.6 as soon as the public API and the internal design 
-on the main branch will be considered stable enough.
+Predis is currently a work-in-progress and it comes in two flavors:
+
+ - the mainline client library, which targets PHP 5.3.x and leverages a lot of the 
+   features introduced in this new version of the PHP interpreter.
+ - a backport to PHP 5.2.x for those who can not upgrade their environment yet 
+   (it admittedly has a lower priority compared to the mainline library, although we 
+   try to keep the two versions aligned as much as possible).
 
 Please refer to the TODO file to see which issues are still pending and what is due 
 to be implemented soon in Predis.
@@ -23,6 +27,9 @@ to be implemented soon in Predis.
 
 ## Quick examples ##
 
+See the [official wiki](http://wiki.github.com/nrk/predis) of the project for a more 
+complete coverage of all the features available in Predis.
+
 ### Connecting to a local instance of Redis ###
 
 You don't have to specify a tcp host and port when connecting to Redis instances 
@@ -105,13 +112,15 @@ variable set to E_ALL.
 
 ## Dependencies ##
 
-- PHP >= 5.3
+- PHP >= 5.3.0 (for the mainline client library)
+- PHP >= 5.2.6 (for the backported client library)
 - PHPUnit (needed to run the test suite)
 
 ## Links ##
 
 ### Project ###
 - [Source code](http://github.com/nrk/predis/)
+- [Wiki](http://wiki.github.com/nrk/predis/)
 - [Issue tracker](http://github.com/nrk/predis/issues)
 
 ### Related ###