As to the seamers, there's no doubt that in the last 2 seasons we've had something of an upturn in things, though naturally there's still much mediocrity and too many unresponsive surfaces.
Towards the end of 2005\06 Asif, the most promising bowler since Allan Donald IMO, emerged; we had Clark at about the same time too; Steyn had a 2nd go and looked the goods as he emphatically had not done in his 1st; Sidebottom, well, almost certainly not in that class, but his re-appearance was welcome. In Steyn and Sidebottom's case, they also benefited from the calibre of pitches and balls improving; in South Africa in 2006\07 and England in 2007, we had more seaming surfaces than I can remember since 2000\01 or 2001, and the balls really swung last summer here for the first time since 2000.
So there's promising signs, and now this Australian summer we have Lee and to an extent Sharma, much as I remain to be convinced about either. Laaasith Maaalinga too has never quite suggested to me that he's the sort of bowler who can have a long, prosperous career but he's certainly a far better bet to do so than some of the dross we've seen since 2001\02. Heck, there's even Kyle Mills, never mind Chris Martin.
Then of course there's the likes of Franklin, Hoggard and Vaas, workmanlike bowlers who've slogged their way through the hard times, doing not doing extraordinarily well but certainly more than respectibly, in their vaastly contrasting ways. Until recently there was Pollock, in the same sort of class since 2001\02. And Gillespie too, until less recently.
In the last 6-and-a-half years, there were really just 2 seam-bowlers of the highest class: McGrath and, when fit, Shoaib Akhtar. Hopefully that might soon change; a return to the glory days of the 1990s would be expecting a bit much, as that decade was almost certainly the strongest for bowling in history; but maybe something more akin to most of the rest of the game's history might be around the corner.