The 6dF Galaxy Survey (6dFGS) has detected a Baryon Acoustic Oscillation (BAO) signal, allowing the authors to constrain the distance-redshift relation at an effective redshift of $z_{\text{eff}} = 0.106$. The measured distance is $D_V(z_{\text{eff}}) = 456 \pm 27$ Mpc, and the distance ratio $r_s(z_d)/D_V(z_{\text{eff}}) = 0.336 \pm 0.015$ (4.5% precision). This low effective redshift makes 6dFGS a competitive and independent alternative to Cepheids and low-z supernovae in constraining the Hubble constant. The authors find a Hubble constant of $H_0 = 67 \pm 3.2$ km s$^{-1}$ Mpc$^{-1}$ (4.8% precision), which depends only on the WMAP-7 calibration of the sound horizon and the galaxy clustering in 6dFGS. Compared to earlier BAO studies at higher redshifts, this analysis is less dependent on other cosmological parameters. The sensitivity to $H_0$ can be used to break the degeneracy between the dark energy equation of state parameter $w$ and $H_0$ in CMB data. The authors determine $w = -0.97 \pm 0.13$ using only WMAP-7 and BAO data from 6dFGS and Percival et al. (2010). The paper also discusses the potential of future wide-angle surveys, such as the WALLABY blind HI survey and the proposed TAIPAN all-southern-sky optical galaxy survey, to detect the BAO peak and constrain the Hubble constant with 3% precision.The 6dF Galaxy Survey (6dFGS) has detected a Baryon Acoustic Oscillation (BAO) signal, allowing the authors to constrain the distance-redshift relation at an effective redshift of $z_{\text{eff}} = 0.106$. The measured distance is $D_V(z_{\text{eff}}) = 456 \pm 27$ Mpc, and the distance ratio $r_s(z_d)/D_V(z_{\text{eff}}) = 0.336 \pm 0.015$ (4.5% precision). This low effective redshift makes 6dFGS a competitive and independent alternative to Cepheids and low-z supernovae in constraining the Hubble constant. The authors find a Hubble constant of $H_0 = 67 \pm 3.2$ km s$^{-1}$ Mpc$^{-1}$ (4.8% precision), which depends only on the WMAP-7 calibration of the sound horizon and the galaxy clustering in 6dFGS. Compared to earlier BAO studies at higher redshifts, this analysis is less dependent on other cosmological parameters. The sensitivity to $H_0$ can be used to break the degeneracy between the dark energy equation of state parameter $w$ and $H_0$ in CMB data. The authors determine $w = -0.97 \pm 0.13$ using only WMAP-7 and BAO data from 6dFGS and Percival et al. (2010). The paper also discusses the potential of future wide-angle surveys, such as the WALLABY blind HI survey and the proposed TAIPAN all-southern-sky optical galaxy survey, to detect the BAO peak and constrain the Hubble constant with 3% precision.