Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Olympus E-330 and Olympus E-450 side-by-side from the front, back and top in their relative dimensions. Olympus E-330 has external dimensions of 140 x 87 x 72 mm (5.51 x 3.43 x 2.83″) and weighs 616 g (1.36 lb / 21.73 oz) (including batteries). Olympus E-450 has external dimensions of 130 x 91 x 53 mm (5.12 x 3.58 x 2.09″) and weighs 426 g (0.94 lb / 15.03 oz) (including batteries).
Below you can see the front view size comparison of Olympus E-330 and Olympus E-450. Olympus E-450 is 10mm narrower and 19mm thinner than Olympus E-330 but it is also 4mm taller.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Olympus E-450 is significantly lighter (190g ) than the Olympus E-330 which may become a big advantage especially on long walking trips.
Also keep in mind that body weight is not the only deciding factor when comparing two interchangeable camera bodies, you have to also take into account the lenses that you will be using with these bodies. Since both Olympus E-330 and Olympus E-450 have the same Four Thirds lens mount and Four Thirds sized sensors, lenses will not be a differentiator on total size of the system.
Unfortunately neither Olympus E-330 / EVOLT E-330 nor Olympus E-450 provides any type of weather sealing in their body, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top DSLR Cameras with Weather Sealing
LCD Screen Size and Features
Olympus E-450's 2.70" LCD screen is slightly larger than Olympus E-330's 2.5" screen.
On the other hand, Olympus E-330 LCD screen has a Tilting feature
where you can change the angle of the screen to make it easier to shoot from waist or over the head levels. On the other hand, Olympus E-450 has a fixed type screen which provides less flexibility in shooting positions compared to E-330.