7+- is a recognizable red herring. There is a better metaphor, but the title led me to think directly of the concept "mentally uploaded". I visit all of the to

7+- is a recognizable red herring. There is a better metaphor, but the title led me to think directly of the concept "mentally uploaded". I visit all of the top ten listed, and twenty or more others pretty regularly, but the idea of a set of web tools makes perfect sense. When web programming for example I am intensely engaged with reference material (php.net/python.org/etc..), multilevel searches (Google/stackoverflow), analytics, hosting, with my surfing ruts, HN and others as a salt. Similarly an R/C hobbyist might have three manufacturers sites, two forums, and 0-4 parts/sales/events/magazines/other sites depending on the level of involvement they want, but I cant imagine really using more than 10 as an amateur. For continuous tasks, like programming/work, you need variety but as few mental leaps as possible. To answer a question about function returns takes a different form than a library tutorial for PIL, but will come up in the same context. For occasional but regular things (home, weekends), within a limited activity, you could group together a small number of loosely joined parts that satisfy your interest. With these restrictions 7 seems like a ballpark number. Hooking up a javascript visited link hack to see what other 7 your users really use could enable you to streamline your service to their habits in some cases.