  Modern knowledge workers typically need to use multiple resources, such as
documents, web pages, and applications, at the same time. This complexity in
their computing environments forces workers to restore various resources in the
course of their work. However, conventional curation methods like bookmarks,
recent document histories, and file systems place limitations on effective
retrieval. Such features typically work only for resources of one type within
one application, ignoring the interdependency between resources needed for a
single task. In addition, text-based handles do not provide rich cues for users
to recognize their associated resources. Hence, the need to locate and reopen
relevant resources can significantly hinder knowledge workers' productivity. To
address these issues, we designed and developed Scrapbook, a novel application
for digital resource curation across applications that uses screenshot-based
bookmarks. Scrapbook extracts and stores all the metadata (URL, file location,
and application name) of windows visible in a captured screenshot to facilitate
restoring them later. A week-long field study indicated that screenshot-based
bookmarks helped participants curate digital resources. Additionally,
participants reported that multimodal -- visual and textual -- data helped them
recall past computer activities and reconstruct working contexts efficiently.
