Which particular brand of idiot would propose "across the board" tax-cuts right now? As Polk pointed out, the top-marginal tax-rate was already cut from 39.5% to 35%, resulting in an immediate drop in revenues collected by the IRS.
Even accounting for state taxes, Americans are taxed less than, I think, any other OECD country with the exception of Japan - a country which is also, not coincidentally, servicing a public debt even bigger than our own (relative to GDP).
We need to a combination of spending cuts and increased taxes until the government is able to (over any arbitrary number of years, say, ten) balance revenues and spending. The last time that happened were the last two years of the Clinton administration.
Neither Republicans nor Democrats have shown any ability to reign in spending in the past decade - in Bush's first 6 years in office, he never once vetoed a spending bill - all 6 of which had built-in massive, record deficits. President Obama came into office in the middle of the worst recession since the great depression, and continued a lot of Bush's policies (eg, bailing out large companies - Bush approved the largest nationalization of a private company in living memory, when he approved some $150 Billion to save AIG).
Most economists, whether you believe they have a clue or not, credit stimulus spending with averting a financial catastrophe, and a repeat of the 1930s. So in the short-term, it's hard to blame the Democrats for spending. It remains to be seen what they do about the budget after the "real" economy has recovered somewhat, maybe in 2011.
Either way - raising taxes, or at least letting Bush's ill-guided tax-cuts expire, is in the cards. George H. W. Bush was so maligned when he raised taxes during his single term, but he was trying to avoid the sorts of deficits that his son rang up. Even Ronald Reagan approved massive "tax-increases", in the form of undoing many of the tax-cuts he campaigned on, when he saw the resulting deficits.
Those who chant, "starve the beast" have been completely unsuccessful in electing politicians who actually are willing to cut spending in response to less revenue, so either we continue borrowing heavily - and it's no longer sustainable for more than a decade or so - or we begin to close tax-loopholes, raise the top marginal tax rates, and re-evaluate the total amount we spend on defense (which, with DoD and DHS spending, is hovering around $700 Billion per year).
This stupid mantra of "cut taxes, cut taxes" begs the question: what is the "right" level of taxation? We're already far below historical norms. Should there be ZERO taxes? Should we have an "across the board" tax-cut of 70%? 80%? 90%? 99%? What, exactly, do you propose the 'right' tax rates should be?
Just saying "cut taxes across the board" isn't a solution, if you don't even acknowledge both the enormous overspending that both parties have done, the gap between spending and revenue from taxes, and the already-low tax rates that a vocal minority constantly ***** about.