While memorizing the Japanese syllabary I continually found myself using the ordering as a crutch. Hence I wrote a little program to quiz myself on characters at random. However, like most projects it kept growing until it was over a thousand lines of code and nice enough for end users. Hope it helps!
The small kana images are from the Auburn High School website and the large ones are from Kanji Step. I couldn't reach either of them so they've been used without permission. I suspect the content isn't really copyrightable but if this is problematic then they can be interchanged with the Wikimedia Commons set, which is in the public domain.
hint: keyboard transversal is much quicker