These electronic annotated editions do take advantage of the medium in some ways, usually including a search function, sometimes allowing concordances to be generated and often including video and sound clips of performances or readings of the work. There are examples of this kind of work on the Web, though few of them are as professional as the commercial CD-ROMs. This is in part due to a lack of time and money, since users generally don't pay those who create content on the Web. Multimedia content is also limited on the Web, both because of the long download time and because of copyright restrictions. Many literary resources on the Web make up for what they may lack in polish by their innovative approaches, thorough research, the opportunity to interact in discussion groups, through constant development, multiple viewpoints, enthusiasm or in many other ways.
Annotated texts are also available in many places.
The Perseus Project , for example, is a large and growing digital library of resources for studying the ancient world. The library's materials include ancient texts and translations, philological tools, maps, extensively illustrated art catalogs, and secondary essays on topics like vase painting. The Perseus Project is edited by scholars and is intended primarily as a resource for researchers. Although this salon of the digital age is a tight-knit and active community, anyone with Web access can register as a member. The Republic of Pemberley is in some ways similar to a CD-ROM annotated edition, but it has many additional features which are impossible without the connection between people that is allowed by the Web.