Very common around this neighbourhood. One of the more useful weeds according to this source:
In traditional herbalism, Herb Robert is used as a remedy for toothache and nosebleeds. An infusion made from the whole plant, minus the root, has been used for its diuretic and tonic effect and as a remedy for dysentery. It is also used on wounds for healing and to prevent scarring, having both an antiseptic and a styptic effect. Freshly picked leaves have an odour resembling burning tires when crushed, and if they are rubbed on the body the smell is said to repel mosquitoes. The active ingredients are tannins, bitters, and essential oils. (T.E.R:R.A.I.N - Taranaki Educational Resource: Research, Analysis and Information Network)
The crushed leaves really do smell like burned tires!