AVG has been around for quite awhile and have recently entered the growing mobile space (we hear Android is gangbusters for a/v scanners). They've now released a free "suite" for Windows Phones, combining an earlier product (Safe Search) with an actual virus scanner:
"Free Security Suite from AVG Mobilation – security software for Windows Phone™. Keep your device safe with just one click"
- Safe Web Surfing - Stay safe from phishing and malware while surfing the web
- Safe Search - Allowing you search the web avoiding malicious web sites
In addition, the virus scanner portion will scan over your music and images. Surprisingly, the scan is pretty fast though we do have to wonder about other vulnerabilities such as PDFs, docx and of course programs. We imagine though when it comes to the latter, AVG can only do so much within the siloed limitations of the Windows Phone OS. So how much of a threat could there be from music or images? We're not too really to sure but we're more concerned about side-loading XAP files from untrusted sources--something which this app doesn't cover.
Still, for being free, it's not bad. It can update/download new AV definitions and the Safe Search/Web Surfing is not bad if you're worried about going to a malicious site. Worth the download? Perhaps--at 5MB, it sure won't kill your device and giving it once-over (under 30 secs for most of you) may not be a bad idea. Read more at http://www.avgmobilation.com/ and pick the app up here in the Marketplace.
Update: Rafael Rivera has broken down the app to see what exactly it does. As of now, since there are no known threats to WP7, it scans for EICAR (test file) and the word עברית (Hebrew) but has no generics capability, meaning there's very little that this will actually scan for.