Trulia has a Crime Maps feature which can help you determine the crime levels of neighborhoods, as well as help you find good schools and amenities in the area.
Here is our link fo Oceanview, San Francisco: http://www.trulia.com/local/#crimes/oceanview-san-francisco
If I can help with anything else, just let me know!
Community Manager, Trulia Voices
Here is a link to the crime stats website that Jed referred to - http://www.sfgov.org/site/police_index.asp?id=23813
Crime is going to occur pretty much everywhere in the city, but keep in mind that San Francisco is very much a block-by-block city in many cases. For example, there are areas in the Mission where I live that are very safe, and others where crime and gang activity is rampant.
In addition to spending time in the Oceanview area, you can call the Ingleside station non-emergency number to get their feedback on the neighborhood as a whole and if there are parts that are particularly good or bad. That number is (415) 553-0123 and the link to the Ingleside station info site is http://www.sfgov.org/site/police_index.asp?id=19972
Lance King/Managing Broker
You can also look at SFPD crime reports for every area of the city bu going to sfgov.org site and then the police department web site. Although remember you are looking at the litany of problems and not actually experiencing the sense of a place.