It’s important to know the main user-agents and search engine spiders in Runet. This can give you information on the indexing of your site, if you understand the various roles each search engine robot plays. It can also allow you to see when your competitors or link partners are cloaking their content. Inserting the following user-agent strings into the User Agent FireFox Plugin would allow you to browse the web as Yandex or Rambler.
Yandex
Yandex/1.01.001 (compatible; Win16; I)
Main Yandex Robot
Yandex/1.01.001 (compatible; Win16; H)
Robot looking for mirror copies or duplicates
Yandex/1.01.001 (compatible; Win16; P)
Robot for Images
Yandex/1.02.000 (compatible; Win16; F)
Robots which indexes favicons
Yandex/1.03.000 (compatible; Win16; M)
Robot to find keywords highlighted in the cache
Yandex/1.03.003 (compatible; Win16; D)
When you add your URL to Yandex this spider is activated
YaDirectBot/1.0 (compatible; Win16; I)
Robot for sites which install the Yandex Direct publishing code (Yandex Direct Partners/Affiliates)
YandexBlog/0.99.101 (compatible; DOS3.30,B)
Robot which indexes XML files for blog search (RSS/Atom)
Yandex/2.01.000 (compatible; Win16; Dyatel; N)
Robot which indexes news streams for Yandex News
Yandex/2.01.000 (compatible; Win16; Dyatel; C)
Robot which checks the availability of sites inside Yandex Catalog/Directory. If they are not available for a few days the site will be removed.
Yandex/2.01.000 (compatible; Win16; Dyatel; D)
The robots moderates Yandex Direct links inside adverts
Yandex/2.01.000 (compatible; Win16; Dyatel; Z)
Robot for the Yandex Bookmarks service
Rambler
StackRambler/x.x
Main Rambler search (Russia) robot (81.19.6x.xx)
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
Googlebot/2.1 (+http://www.google.com/bot.html)
Googlebot/2.1 (+http://www.googlebot.com/bot.html)
**Amazing Nanobot image by Ajax, one of the artists at TheLensFlare.com**
Sphunn: http://sphinn.com/story/63932