Terms and Tags, that are used in this blog.

LMB=Left Mouse Button = M1.
RMB=Right Mouse Button = M2.
Project '...'= Big idea.
FF = Friendly Fire.
{v}= read existing post about this thing.
** = there will be special post about additional information about this thing.
& = not my idea.

All Tags(i.e. Labels) and what some of them mean:
10th class: imaginary class
1st: mostly means "Primary"
2nd: mostly means "Secondary"
4th: related to the Engineer's 4th slot - PDA (and his buildings).
9: about all 9 classes
action: mostly - about the Action Slot
Arena: gamemode or the place.
bombs: i.e. GL's grenades (the label "nades" is more correct at this case); or something else
Bonk Atomic Punch: concrete weapon.
crafting
Demoman
DPS: damage per second (eg., afterburn, bleeding)
duel: firstly, the minigame "Duel"; or something about the duel (mechanics)
Engineer
existing: the items, which are currently implemented in-game
gamemode: mostly - official gamemode (for the unofficial find the label "modification")
Grenade Launcher
grenades: TFC-like grenades (eg.,mechanics)
hats
Heavy
ideas
items
joke: the post isn't serious.
levels: usually - the lvls of the items
maps
mechanics: how the thing works
medal
Medic
Medigun
minigame: eg., "Duel"
Minigun
misc.: Misc. cosmetic items
new: the opposite to the label "old" - it means that the idea is new (in the interval of a few months at the date of the post)
not TF2: the post is related not only to TF2
old: it means that the idea was created so much time ago, that I can't even remember some details about it.
other games
Pilot: the name of the imaginary 10th Class
Primary: most of all - the slot
Pyro
quality: i.e. item quality, first of all.
random: there is an element of the randomness.
Rifle: most of all - Sniper's Rifle (don't mess with the concrete weapon "Sniper Rifle")
Rocket Launcher
Sandman
scheme
Scout
set: the set of the items (eg., the Saharian Spy)
slot: eg., Primary/Secondary/Melee/Hat/Misc1/Misc2/Action, etc.
small
Sniper
soft: the useful programs
Soldier
SPUF: SteamPowered Users' Forums
Spy
Steam Trading
store: MannCo Store
style
synergy: when >1 of the players (classes) collaborate with each other (not only about teammates)
teamwork: see the label "synergy" (only about teammates)
tips: hints
to be continued...: the post will be updated, or the new post will continue this post.
tool: eg. Paint, Name Tag, etc.
unlock: not the Stock item
update
utility: the item, which isn't used as a weapon, but as a helpful thing
voice commands
weapons

/to be continued.../