Wirelessly posted (Mozilla/5.0 (iPod; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5)
Safari Web Content is part of WebKit2, I believe. As for helpd, I don't know: maybe help indexing?
Safari Web Content is something new in Lion for security. It sandboxes website scripts like javascript and flash. If someone was to insert a malware script in a website they can no longer do whatever they want with you once exploiting whatever vulnerability it was.
You can also "guess" at what a program is by inspecting it in Activity monitor and choosing Open Files and Ports. You can sometimes get an idea from what files it is using.