S - Select Larva
U - Burrow
G - Guardian Aspect
D - Devourer Aspect
L - Morph to Lurker

Units

D - Drone
Z - Zergling
O - Overlord
H - Hydralisk
M - Mutalisk
S - Scourge
Q - Queen
U - Ultralisk
F - Defiler (Drone is D)

Drone Mutation
B - Basic Mutation (Buildings)

Then...

H - Hatchery
C - Creep Colony
E - Extractor
S - Spawning Pool
V - Evolution Chamber
D - Hydralisk Den (H is already used for "H"atchery)

V - Advanced Mutation (Buildings, A is use for Attack and is not available for "A"dvanced)

Then....

S - Spire
Q - Queen's Nest
N - Nydus Canal
U - Ultralisk Cavern
D - Defiler Mound.

Special Abilities
Queen

R - Parasite
B - Spawn Broodling
E - Ensnare
I - Infest Command Center

Defiler

W - Dark Swarm
G - Plague
C - Consume

Upgrades
Because upgrades require more decision making and are not used as often, you might want to learn the building and unit Hot Keys first before trying to learn the Hot Keys to the upgrades.

Hatchery

L - Upgrade to Lair

Lair/Hive

H - Upgrade to Hive
B - Evolve Burrow
V - Evolve Ventral Sacs
A - Evolve Antennae
P - Evolve Pneumatized Carapace

Spawning Pool

M - Evolve Metabolic Boost
A - Evolve Adrenal Glands

Hydralisk Den

M - Evolve Muscular Augments
G - Evolve Grooved Spines
L - Evolve Lurker Aspect.

Spire

A - Upgrade Flyer Attacks
C - Upgrade Flyer Carapace
G - Mutate into Greater Spire

Queen's Nest

B - Evolve Spawned Broodling
E - Evolve Ensnare
G - Evolve Gamete Meiosis

Defiler Mound

G - Evolve Plague
C - Evolve Consume
M - Evolve Metasynaptic Node

Ultralisk Cavern

A - Evolve Anabolic Synthesis
C - Evolve Chitinous Plating