For 750 MHz LVDS, try the following suggestions:
The diffpair has to be symmetric and common centriod. The whole stage should preferably be enclosed in a guard ring to separate it from digital stuff, if any.
A guard ring is nothing but a rectangle shaped ground ring over pplus and an nwell over nplus with active regions and connections to ground and vdd respectively.
Also the high frequency signals should be routed over an n-well to reduce substrate noise injection caused by them.
Whenever you use resistors, use dummys on all sides to match the boundary conditions.
Interleave resistors to reduce mismatch between them.
Make sure that every connection from one metal layer to the other has four vias arranged as a square, so that the resistance and inductance is reduced. otherwise at 750Mhz, there will be a delay associated with every via.
Also to ensure a good ground (necessary for highspeed links), slot the ground plane to make a mesh grid pattern, so that there is no localized eddy currents flowing.
Put a capacitor between vdd and vss ( the decoupling cap) calculate using the typical inrush current at startup.
Also use an inductor between vdd and the top pmos(es) to reduce vdd noise coupling. This alone reduces the phase noise in oscillators by about 4dB and is a well known technique. Ask someone for more advice.
use an inductor between vss islands so that a localized disturbance at one ground plane does not immediately affect the ground at another point.
Use ground contacts, each contact has a typical resistance of ~1 ohm for new submicron technologies. use as many as you can for guard rings.
Avoid poly routing except for tracks less than 5um.
For all your transistors, the gate should be connected on both sides to the input, forming a ring. (using poly if desired). Read more about this technique in Razavi's analog design book. This reduces the gate resistance and helps at high frequencies.
For signals going to a sensitive block, land them first, on top of an n-well and then use a via-bridge and then take them further. This helps to reduce unwanted coupling between block.
An advantage of a guard ring is that supplies can be routed to the block efficiently and the resistance is reduced, compared to a tree or a comb structure.
Whenever signals are splitting, try to make a small metal hexagon and then split the signals. (N.B. this is a veryhigh frequency technique). Try not to make y-shaped splits.
Slot the power supply lines in the direction of the current flow to reduce the risk of electron migration and increased resistance which is normally not extracted by any tool.
Other major techniques can be found in the books mentioned by other participants.
Have fun.