PhoneGap allows developers to create mobile apps using web technologies like JavaScript instead of native languages. The presentation introduces PhoneGap and builds a simple encrypted TODO list app as an example. It then proposes CrypTag, an encrypted, taggable, and searchable web storage app where the tags are encrypted on the client and only random strings are sent to the server for increased security and privacy. The talk closes by inviting attendees to future events at the hackerspace and providing contact details.