I would like to be able to organise my lists on my Macintosh desktop computer too.
And then for it to sync with my iPhone version of Pocket Lists.
The reason for this is because sometimes my internet connection is slow (and therefore typing in new lists in my internet browser can be slow, especially when switching from one list to another).
Another reason, is that the Pocket Lists user interface is better than the one on Google Tasks - for example in Pocket Lists you can re-order your lists (whilst in Google Tasks it orders it alphabetically).
I notice that this other program can be used on both desktop and iPhone, and you may also wish to follow a similar business model:
http://dropkickapp.com
(I don't want to use dropkick app because from the screenshots of the iPhone, it doesn't seem to show more than 1 line for each item (some long items may go onto 3 or more lines), and also because "dropkick" can be a derogatory term in Australia.)