This very forum can confirm it:
I think that it is legitimate traffic, but there is a ridiculous amount of it: ~250 requests per second.
What was your traffic just 12 hours ago (If you even can check that now)? That was when the first lag wave started happening before a brief slow down, around 9 hours ago the second lag wave showed up. Around 1 hour after that I believe legit traffic started showing up (8 hours ago)
Maybe I'm just a bit delusional ^^
edit: Everything might just have lined up in a suspicious way based on the exchanges I'm using, it might have just been an coincidence I guess. I can't help to think something about it all was shady though (I also called the crash on skype 10 minutes before it happened saying "Weekly DDoS just started" @ 3:26PM UTC >_<.
[4/10/2013 3:26:29 PM] alkhdaniel: bitcoin crash is about to happen
[4/10/2013 3:26:34 PM] alkhdaniel: this same thing happens almost every week
[4/10/2013 3:26:38 PM] alkhdaniel: somebody dumps an large'ish sum of bitcoins
[4/10/2013 3:26:43 PM] alkhdaniel: then starts ddosing the exchanges
[4/10/2013 3:26:46 PM] alkhdaniel: everyone starts panicking, selling their coins
[4/10/2013 3:26:52 PM] alkhdaniel: then he probably buys back his coins for a cheaper price
[4/10/2013 3:27:13 PM] alkhdaniel: so fucking gay
-20 seconds later-
[4/10/2013 3:27:33 PM] alkhdaniel:
https://bitcoin-24.com/[4/10/2013 3:27:33 PM] alkhdaniel: Website currently unavailable
[4/10/2013 3:27:33 PM] alkhdaniel:
https://btc-e.com/exchange[4/10/2013 3:27:33 PM] alkhdaniel: Website currently unavailable
[4/10/2013 3:27:51 PM] alkhdaniel: Mtgox trading engine lag: 313.98s
[4/10/2013 3:29:31 PM] alkhdaniel: $244
[4/10/2013 3:29:53 PM] alkhdaniel: exchanges are back up!
[4/10/2013 3:31:29 PM] alkhdaniel:
https://bitfloor.com/user/trade[4/10/2013 3:31:29 PM] alkhdaniel: Bitfloor
[4/10/2013 3:31:29 PM] alkhdaniel: The servers are misbehaving.
This is a chart of mtgox usd, look at 3:25pm to to 3:35pm, there was almost no bitcoins sold or bought during this time, yet all the big exchanges went down and mtgox got 1000sec+ lag. Look at what happened around 3:20pm to 3:25pm, a large'ish sale.
https://i.imgur.com/SEYCjn7.png - the middle line is (probably) 3:30pm