Wireshark Filters

ssl/tls start/finish filter:  tcp.flags & 0x02 || tcp.flags.fin == 1 || ( tcp.flags.ack == 1 && tcp.seq == 1 && tcp.len == 0)
http req/resp:  http.request|| http.response
smtp commands: smtp.command_line
POST's:  http.request.method == "POST"
Display...pretty much all everything you'd want to show to someone:  (http.request.full_uri||http.response||dns.flags == 0x0100||ssl.handshake.type == 1) && !(ssdp)