Finaly after 2 months opencart 1.5.3 is released with some important new features.

You can download it here:

http://opencart.googlecode.com/files/opencart_v1.5.3.1.zip

See the official release thread for more info:
http://forum.opencart.com/viewtopic.php?f=2&t=65250

If there are any bugs you can post them in this thread:
http://forum.opencart.com/viewtopic.php?f=161&t=65248

NEW:
Company ID and TAX ID fields.
VAT number checking.
CKeditor updated to the latest .
Jquery updated to the latest. 
Voucher min/max limits in settings.

FIXED:
SQL error in install
Bulgarian zones list is incomplete
more...

Please refer to  the bug tracker list for all the fixes done:

http://code.google.com/p/opencart/issues/list?can=1&q=status=Fixed&sort=-id&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Summary%20Reporter

Enjoy!