SQLite's author, D. Richard Hipp, provides professional support and consulting for SQLite. More information can be found at www.hwaci.com/sw/sqlite/support.html.
The SQLite web site is an invaluable source of information, including the complete documentation to SQLite's SQL C API, as well as its associated subsystems such as the VDBE: www.sqlite.org.
SQLite Mailing List: groups.yahoo.com/subscribe/sqlite.
Information related to third-party software, such as drivers and extensions, along with other miscellaneous information is available on the SQLite Wiki: cvs.hwaci.com:2080/sqlite/wiki.