I love memrise. Not just as a concept or a webapp, but as a learning tool. I use it daily. But there are a few issues that I wish they would address that just haven’t been done yet, so I wrote a Greasemonkey script to fix them.
The main thing this script does is eliminate the need to hover to see garden items, but there are a couple of other little tweaks in there too. Grab it at userscripts.org: Memrise Tweaks for Greasemonkey