Mass-effect – How to rescue Barla Von’s Shadow Broker forces

If you have not played the Lair of the Shadow Broker, Liara is initially referred to as an information broker, like she was on Illium.

...until you get onto the privacy of the Normandy, where she has set up shop, and admits to Shepard that she has tracked down and usurped "the galaxy's most notorious information broker".

The dialog is a bit different if you actually helped her (via the DLC), but the outcome is the same regardless.

Being below weight capacity proportionally increases power recharge speed. Being above it decreases it. Carrying less guns reduces your weight (thereby increasing recharge speed). It does not affect the amount of ammo individual weapons hold (mods do).

The wiki weapons entry doesn't currently have individual weights for weapons, but likely that information will be added soon. In the meantime on the weapon equip screen as you add/remove weapons it will give you a percentage penalty/bonus to recharge rate. This can give you a base idea, but ultimately if you use a lot of powers you'll want to equip as few weapons as possible and put some points into increased carrying capacity.