Jumi is a handy Joomla extension that lets you include arbitrary code in Joomla without messing around more than you have to. I recently upgraded a client's install to Joomla 1.7.3 and tried to install Jumi, but got the following error:
Warning: constant() [function.constant]: Couldn't find constant JPATH_ in .../libraries/joomla/installer/adapters/module.php on line 115 Module install success Plugin install success Router install success
The extension mostly worked, but translations were missing. To cut a long story short, after some scraping around I found that the problem is fixed in Jumi 2.0.7, which is the version shown on the download page and the version I thought I'd downloaded. It turns out that the download link actually points to 2.0.6, which doesn't work with Joomla 1.7. I checked the trunk version in the SVN repository and it's tagged 2.0.7, so I tried it out and installation was flawless.
If you want to use the SVN version yourself you can use the following command to create a trunk Jumi package which you can then install in Joomla:
svn checkout http://jumi.googlecode.com/svn/trunk/package_J16 zip -r jumi_trunk_for_J1.7.zip package_J16/ -x \*/.svn/\*
To save you time, I've put together a working Jumi package that you can download and use straight away: