The 0.8.5 version of the Excel extension was released and is now available for download, it contains a number of small build fixes, which makes it possible to compile it against all versions of PHP (5.2,5.3,trunk). The Win32 compilation was also fixed and thanks to Kalle, PHP 5.3 win32 binaries are now available for download as well.
GitHub:
http://github.com/iliaal/php_excel/
Source:
http://github.com/downloads/iliaal/php_excel/php-excel-0.8.5.tar.bz2
Win32 Binaries:
http://github.com/downloads/iliaal/php_excel/php-excel-5.3.zip