The site is a collection of wiki pages with many different indexing schemes. You can find pages by any one of these indexes however in some cases information about a given chip is unknown or unavailable so it won't be in all of the indexes. Here are the current indexes and a brief description of what they're good for.
When adding new pages, please tag as accurately as you can and cite data when possible (for example, tagging a device as a certain vendor based on seeing a logo is fine, but don't guess). We'd rather have a device marked as unknown than tagged incorrectly and confuse people.
In addition to these, we have a few random pages filed under the “other” category that are not about specific chips.