Ah, good. Usually, the bar is set at "lying," which is so much harder to prove than dishonesty.
1) The perscription drug bill cost over a hundred billion dollars more than they said it would. Not because of an honest mistake, but because an accurate estimate was deliberately supressed until after the bill passed.
2) The administration said that the reconstruction of Iraq could be paid through oil revenues. Larry Lindsey publically estimated the cost of the Iraq operation at about $200 billion dollars and was fired.
3) Bush has said that Iraq is making good progress, counter to the National Intelligence Estimate. Also, Bush said that the NIE's three possible scenarios were "life could be lousy, life could be OK, life could be better." In fact, the best case scenario involved violent drift with no significant improvement.
4) Bush says that Kerry voted for the war. At the time of that vote, Bush said he was working to solve the situation peacefully. Even now he says he wanted to avoid a war. One way or the other, he's being dishonest. (Though Kerry should absolutely have to take some responsibility for the decision to give Bush the authority)
5) Bush either lied or changed his position without any explanation on mandatory emissions standards for carbon dioxide.
6) Bush said Iraq had ties to Al Qaeda. At best this is a rhetorical trick. At worst, a lie.
7) Bush absolutely, positively lied about his personal experience on 9/11/01. Not a policy matter, but still a lie.
8) This is a fun one. Bush said that his budget would cut the deficit in half in five years. At the time, the OMB estimated the budget would be halved in five years, assuming that Bush's tax cuts were phased out. Yet Bush was pushing for the tax cuts to be made permanent. So essentially he was claiming that his budget plan would halve the deficit, when the estimates showed that result only if his plan was defeated.
Bush is still making this claim about cutting the deficit in half, though he can no longer back it up with any numbers. Also, this assumes no AMT reform, and not a single dollar spent in Iraq or Afghanistan after 2005.
9) Bush said that "There's a blue chip survey from leading economists that predict growth this year of 3.3 percent" dependent on Congress passing his tax cut. The survey he was citing did not ask the economists to take the tax cut into account.
10) Bush said that after weapons inspectors were "finally denied access" in Iraq (which happened in 1998), the International Atomic Energy Agency released a report saying Iraq was six months away from developing a nuclear weapon.
In fact, there was an IAEA report in 1998 that said Saddam had been six to 24 months away from this goal, back in 1991, but that the war and inspections had crippled his operation. Ari Fleischer, Bush's spokesman at the time, twice claimed that Bush meant to cite other sources (US intelligence, then the International Institute for Strategic Studies [The IISS report did not have a six month claim]).
11) Bush said that during his campaign he had listed three situations in which running a deficit would be acceptable. There is no record of him saying this, either in Chicago, where he claimed to have said it, or anywhere else. Oddly enough, there is a record of Gore saying this.
12) The "transfer of sovreignty" to the Allawi government in Iraq was moved up a day to head off possible violence. This was widely acknowledged, and the transfer was done quickly and in seclusion. Bush has bragged that it was "not only on time, but ahead of schedule." Literally factual, but very disingenuous.
13) Bush just said "The Taliban is no longer in existence." It is.
14) Rumsfeld and Bush have both cited large figures for Iraqi police forces, 100,000 to 200,000, when the esimates of Iraqi police who have actually completed the training course are much, much lower (less than 10,000).
That's all I've got right now. There are some others (gay marriage/states rights, patient's bill of rights, unsourced and incorrect statistics cited for tort reform, etc.), but it's 5:26 AM, so I hope you'll excuse me for being incomplete.