Help! I enabled a buggy module and now I can't disable it!
A situation can arise where you've enabled a module through administer >> modules, but then because of a fatal error of some kind cannot get back to administer >> modules to disable it (sometimes you cannot access any pages of your site at all) -- only the error is displayed and nothing else.
This can be resolved by executing the following query in the database:
UPDATE `system` SET `status` = '0' WHERE `name` = 'module_name' LIMIT 1;
This will disable the module so that you can access your administration panel again.

deleting the module from ftp
This worked for me at least, then you just disable it in "modules" menu...
Jan
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Orphaned code...
That wouldn't remove the mention of the module in the 'system' table. I tried deleting via ftp and disabling using the "membership" module--a relatively simple module, too--and I still ended up with links and code that I had to track down and remove manually. I'd love to see a list of objects altered by module installation, so I could be sure I got everything out.