'Active' daily keyword searches
There is another reference manager which you can define a set of keywords. It obviously does an automatic daily trawl of a subset of the search engines and if there are any papers which match any of the keywords, it will add them to a folder in your library automatically, as well as sending you an email about the new papers.
I really like the interface, feel and usefulness, but I'm still torn between another reference manager and Colwiz because of the lack of this feature....
Very glad to hear that you like our user interface. Coincidentally, our product team have had several recent discussions relating to your query. We are in the process of developing a variety of similar smart organisational mechanisms. Please check out our blog, where we will soon be posting new and upcoming releases (http://blog.colwiz.com/).