We have released a new update today for the Lists section. It is now possible to search a list for a particular value in one of the columns.
To activate this feature, click on the heading for the column that you want to search in. Then in the "filter" box you can type in some text and Toodledo will find the rows that match that search. You can even search on multiple columns at the same time.
Currently, text and number columns are supported with simple searches. In the future we will extend this to allow searching on dates and numbers by ranges and other advanced search criteria.