FX-Foundry project is constantly updating custom scripts for each major Gimp release.
Last pack contain more then 100 scripts updated for gimp 2.6
In case you do not need such huge pack you may also search (for category, name, author's name etc) and download single scripts.
Note that many scripts included are not listed in this registry, before ask in this or other gimp forum help to update some old script you may better check on FX-Foundry ,good chances was already updated
(I will have preferred let Alexia Death ,the project 's leader, describe with her words, but time is passing by and this new here is still missed ... )
last script pack for gimp 2.6
To browse/download the scripts by several indexes