I think in .override there should be a "kwargs" 

> %%
> - override gnome_keyring_find_items_sync
> + override gnome_keyring_find_items_sync kwargs

In any case, if you do something like this it crashes:

 ids = gnomekeyring.find_items_sync(gnomekeyring.ITEM_GENERIC_SECRET,
                                               {'whatfor' : whatfor})

incidentally, after asking alex how the heck to use gnomekeyring, my impression is that find_items is essential. The keyring.py example that comes with the python bindings stuffs the "id" in gconf whenever it creates an item; this is pretty much a weird hack, the right thing to do is just find the item again on startup with find_items. No need to use gconf to store the item id.