We've seen smartphones, wearables and tablets galore here at Mobile World Congress, plastered with mucky fingerprints and goodness knows what else over the week on the show floor. But that's not all. During our travels we've also discovered some weird and wonderful products that require a roundup of their own. Without further ado, here's the "best of the rest," a collection of the good, the bad and the downright strange that didn't make our other catch-up pieces.