AdoDB is replaced by PDO
	 to activate it just add $api_tiki='pdo' to your db/local.php
	PEAR:Date is replaced by the new Date/Time functions from PHP5
	 to activate it do to Admin->General and uncheck "Use PEAR::Date library:"

By default nothing is changed after this update, you have to manually activate
the new replacements...

Please test !

There are short comings like, sqlogs and installer that are not yet converted...

Now to convince you to switch ! 
PHP5 without cache for the default tiki page after fresh install :
 o adodb+PEAR::Date				: 0.49s 13.84MB
 o adodb+Date replacement : 0.42s 11.47MB
 o PDO+Date replaceemnt		: 0.39s	9.96MB

PHP5 with xcache opcode compiler :
 o adodb+PEAR::Date				: 0.23s 5.08MB
 o adodb+Date replacement : 0.21s 4.14MB
 o PDO+Date replacement		: 0.21s	3.85MB