This chapter reports an approach to enhance the mechanical strength of silica aerogels via densification. Although the loss of porosity and consequently the increase of thermal conductivity of silica aerogels represent drawbacks related to the densification process, a combination of enhanced mechanical performance and optical transparency indicates that the densificated silica aerogels may be used as new glass material for window glazing application. Preliminary experimental results indicate lightweight (density 1.8 g/cm³, compared to 2.5 g/cm³ for float glass) and thermal insulating (thermal conductivity k ≈ 0.18 W/(mK), compared to about 0.92 W/(mK) for float glass) aerogel glass materials with high visible transparency (T_vis ≈ 95.4% at 500 nm, compared to 92.0% for float glass) can be achieved by annealing an acid-catalyzed silica aerogel precursor at 700 °C. Typical elastic modulus E_r of the obtained aerogel glass materials is about 6.42 GPa, which can be further enhanced by, e.g., increasing the annealing temperatures.