With Google Maps and a good phone, using public transit in San Diego is like having your own personal chauffeur. However, sometimes it's helpful to get a route map or schedule, and the MTS's site doesn't work on my Blackberry. This simple site give you direct links to different route information.
Routes
Many of the low digit routes are old streetcar routes
1 Hillcrest - El Cajon Blvd - La Mesa map
2 Downtown - 30th Street! map
3 Euclid Av - Downtown - Mission Hills map
4 Imperial Ave - Jamacha Rd map
5 Market St map
6 Mission Valley - North Park map
7 Downtown - Balboa Park - University Ave - La Mesa map
8/9 Old Town - Mission Bay map
10 Old Town - University Ave - College Area map
11 Skyline - Logan Heights - Hillcrest - Adams Ave map
13 National City - Kensington - Grantville map
14 Old Town - Mission Valley - SDSU - Lake Murray map
15 Downtown - Hillcrest - El Cajon Blvd - SDSU map
18 Mission Valley map
20 I-15 map
25 Linda Vista - Serra Mesa - Tierrasanta map
27 Pacific Beach - Clairemont map
28 Old Town - Point Loma map
30 Downtown - Beaches - La Jolla - UCSD map
31 Miramar - Mira Mesa map
35 Old Town - Ocean Beach map
41 Linda Vista - University City map
44 Old Town - Clairemont Mesa Blvd map
50 Downtown - Old Town - UTC map
The 80's serve UCSD and the Navy
83 Downtown - Mission Hills map
84 SPAWAR map
86 UCSD map
The 100's connect transit centers
105 Old Town - UTC map
115 SDSU - El Cajon map
120 Downtown - Fashion Valley - Kearny Mesa map
150 Downtown - UTC map
210 Mira Mesa - I-15 - I-94 - Downtown map
The 700's are all South Bay
701 map
704 map
705 map
707 map
709 map
712 map
The 800's serve remote areas
810 Escondido - Rancho Bernardo map
815/816 El Cajon - Jamacha Rd map
820 Poway map
832 Santee map
833 Santee - El Cajon map
834 Santee map
844 Poway map
845 Poway map
848 Lakeside - El Cajon map
850 Poway map
851 La Mesa - Spring Valley map
854 La Mesa map
855 La Mesa - Rancho San Diego map
856 SDSU - Rancho San Diego map
860 Rancho Bernardo - Poway map
864 El Cajon - Lakeside - Alpine - Viejas map
870 Kearny Mesa - Santee - El Cajon map
871/872 El Cajon map
874/875 El Cajon map
880 UTC - Rancho Bernardo map
888 El Cajon - Old Highway 80 - Jacumba map
891 Fridays: El Cajon - Ramona - Santa Ysabel - Julian - Borrego - Warner Springs map
892 Thursdays: El Cajon - Ramona - Santa Ysabel - Julian - Borrego - Warner Springs map
894 El Cajon - Hwy 94 - Campo - Buckman Springs map
The 900's -- who knows?
901 Downtown - Coronado - Imperial Beach map
904 Coronado map
905 Highway 905 (Otay Mesa) map
916/917 City Heights - Lemon Grove - Market Street map
921 UCSD - Sorrento Valley - Mira Mesa map
923 Ocean Beach - Harbor Drive - Downtown map
928 Mission Valley - Kearny Mesa map
929 Downtown - Tijuana map
932 Downtoqn - Tijuana map
933/934 Imperial Beach - Otay Mesa map
936 SDSU - Spring Valley map
955 National City - SDSU map
960 UTC - Euclid Ave map
961 National City - Encanto map
962 National City - Spring Valley map
963 National City - Bonita map
964 Mira Mesa - Alliant University map
965 City Heights - Azalea Park map
967/968 National City map
972 Sorrento Valley - Sorrento Mesa - Torrey Pines map
973 Sorrento Valley - Sorrento Mesa - Torrey Pines map
978 Sorrento Valley - Sorrento Mesa - Torrey Pines map
979 Sorrento Valley - Sorrento Mesa - Torrey Pines map
992 Downtown - Airport map
Other Transit
Trolley Timetables
North County Buses
North County Sprinter
The Coaster
Amtrak