1and1 workaround
create a new database at 1and1 (make sure you choose mysql 5 - unfortunately the install script sees it as 4.4.9)
edit install/1.php
change line 8 to 'simplexml' => true,
change iine 13 to $_SESSION['serverchecklist']['php'] = (intval(phpversion()) >= 4);
create or modify .htaccess with the following:
AddType x-mapp-php5 .php
AddHandler x-mapp-php5 .php
now you can run the powergallery install wizard on your 1and1 account