Onslaught/Mirrodin
Generally a boring standard, with only really 3 deck types that stand out from the rest.
Affinity
Big daddy of the standard. Aggressive using fast "two-mana producing" lands and affinity cards. Uses skullclamp to draw lots of cards, as well as using arcbound ravager to pwn. A faster kill was made using disciple of the vault and sacing everything to the ravager. Later variants (due to clamp banning) used cranial plating for faster damage, but less drawing power. The entire archetype was nerfed when all of the lands, disciple, and ravager himeself were all banned from standard.
12Post
Big-mana deck that used the fact that ravager was so fast that removal was practically useless unless it killed artifacts. 12post used the namesake card "cloudpost" and 8 tutors for them (amounting to 12) to get to large amounts of mana to power a 9-mana tooth and nail, which found their winning condition (which used to be leonin abunas + platinum angel, or vampire + triskelion). The rest of the deck was designed to be anti-affinity or mindslaver, which later became mana disruption when affinity was banned. Later variants used urza lands instead of cloudpost, due to the advent of ponza.
Red Deck Wins/Ponza
Generally Red Deck Wins and Ponza are relatively similar. Ponza blew up lands, and was ideal for killing TnN as well as affinity. Red Deck Wins was just heavy against artifacts (aka affinity). Both used powerful burn and arc slogger to finish the game relatively quickly after destroying the early beatings. A note to that was that it beat 12post in the finals when affinity first appeared.
Slide
Slide was still around, and was designed to be White/Green and was designed solely to beat affinity to the ground. Every card in that deck was anti-affinity in some form or shape! The same principle of the original slide still applied (stall the game with slide and WoG, win with a winning condition).
Goblins
No change from before, except during the short period when skullclamp was around, in which goblins went to hyper-mode with giant biddings and laughing an WoGs even though they overextended. There was no such thing as overextending with skullclamp around. Died down later because it was slower than affinity. Monored variant fell out of favour and the black/red variant was the common one.
Mirrodin/Kamigawa
Tooth and Nail
The Urza land variant ran rampant, with 3 winning conditions (TnN, Rude Awakening, and mindslaver) as well as heavy land disruption from the green. TnN was the big one coming out of Mirrodin after Affinity's death. Same thing as before. Monogreen.
Monoblue Control
Control using only blue cards. Wins by Miroku, the Clouded Mirror (of victory). Jushi Apprentice variants also occured.
Greater Gifts
Uses the namesakes Gifts Ungiven to tutor for stuff, and greater good to sac the 6-mana dragons for massive card advantage. Lots of variations between builds, but always had green, blue, and black. Green for greater goods and acceleration, blue for gifts, and black for Kokusho.
White Weenies
Monowhite with efficient small beaters with leaders such as that stupid dog whose name I have forgotten. Plays jitte, the new most hated card in standard.
Viridian Rats
A bunch of rats and viridian shaman. Aggro-control deck that punishes the hand, kills early creatures, and then wins with the jitte. Shaman destroyed any artifact threats.
Alarm
A combo deck using Intruder Alarm, the green spellbomb (don't remember name), and forbidden orchard to generate infinite mana and win. Rest of the deck rounded out with card drawing, and kiki-jiki for alternative alarm winning condition.
Just to show you that I never paid attention to this standard. I don't remember anymore decks... Oh, all creature and creature-based decks played jittes. 4 of them. Automatically.