I was just looking around the web for a light-weight MySQL script and I found phpminiadmin. It is a small (10kb?) single page script that is WAY faster than using phpMyAdmin or even SQLite.
If you are on a free hosting environment without phpMyAdmin or need a simple database manager for your site you should try phpMiniAdmin out!
Warning!
It is not as GUI centered as phpMyAdmin! If you rely on pretty visual icons to know what to do next and are very new to mySQL or databases then this script is probably not for you.
I was thinking of making one for sqlite myself one day... Only using my sqlite_database classes (when they're all done...)... We'll have to se about that :P
Alxandr